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class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Light and CO<sub>2</sub> limitations</span> </div> </a> <ul id="toc-Light_and_CO2_limitations-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Soil_depletion" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Soil_depletion"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Soil depletion</span> </div> </a> <button aria-controls="toc-Soil_depletion-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Soil depletion subsection</span> </button> <ul id="toc-Soil_depletion-sublist" class="vector-toc-list"> <li id="toc-Colonial_Impacts_on_Soil_Depletion" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Colonial_Impacts_on_Soil_Depletion"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Colonial Impacts on Soil Depletion</span> </div> </a> <ul id="toc-Colonial_Impacts_on_Soil_Depletion-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Soil_Depletion_and_Enslavement" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Soil_Depletion_and_Enslavement"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Soil Depletion and Enslavement</span> </div> </a> <ul id="toc-Soil_Depletion_and_Enslavement-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Global_Soil_Depletion" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Global_Soil_Depletion"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Global Soil Depletion</span> </div> </a> <ul id="toc-Global_Soil_Depletion-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Dark_Earths" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Dark_Earths"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Dark Earths</span> </div> </a> <button aria-controls="toc-Dark_Earths-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Dark Earths subsection</span> </button> <ul id="toc-Dark_Earths-sublist" class="vector-toc-list"> <li id="toc-South_America" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#South_America"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.1</span> <span>South America</span> </div> </a> <ul id="toc-South_America-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Africa" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Africa"> <div class="vector-toc-text"> <span class="vector-toc-numb">4.2</span> <span>Africa</span> </div> </a> <ul id="toc-Africa-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Humans_and_Soil" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Humans_and_Soil"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>Humans and Soil</span> </div> </a> <ul id="toc-Humans_and_Soil-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Irrigation_effects" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Irrigation_effects"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>Irrigation effects</span> </div> </a> <ul id="toc-Irrigation_effects-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Global_distribution" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Global_distribution"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>Global distribution</span> </div> </a> <ul id="toc-Global_distribution-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">8</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">9</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Soil fertility</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 40 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-40" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">40 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AE%D8%B5%D9%88%D8%A8%D8%A9_%D8%A7%D9%84%D8%AA%D8%B1%D8%A8%D8%A9" title="خصوبة التربة – Arabic" lang="ar" hreflang="ar" data-title="خصوبة التربة" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/Torpa%C4%9F%C4%B1n_m%C3%BCnbitliyi" title="Torpağın münbitliyi – Azerbaijani" lang="az" hreflang="az" data-title="Torpağın münbitliyi" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A3%D1%80%D0%B0%D0%B4%D0%BB%D1%96%D0%B2%D0%B0%D1%81%D1%86%D1%8C_%D0%B3%D0%BB%D0%B5%D0%B1%D1%8B" title="Урадлівасць глебы – Belarusian" lang="be" hreflang="be" data-title="Урадлівасць глебы" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9F%D0%BE%D1%87%D0%B2%D0%B5%D0%BD%D0%BE_%D0%BF%D0%BB%D0%BE%D0%B4%D0%BE%D1%80%D0%BE%D0%B4%D0%B8%D0%B5" title="Почвено плодородие – Bulgarian" lang="bg" hreflang="bg" data-title="Почвено плодородие" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Fertilitat_del_s%C3%B2l" title="Fertilitat del sòl – Catalan" lang="ca" hreflang="ca" data-title="Fertilitat del sòl" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cv mw-list-item"><a href="https://cv.wikipedia.org/wiki/%D0%9F%D1%83%D0%BB%C4%83%D1%85%D0%BB%C4%83%D1%85" title="Пулăхлăх – Chuvash" lang="cv" hreflang="cv" data-title="Пулăхлăх" data-language-autonym="Чӑвашла" data-language-local-name="Chuvash" class="interlanguage-link-target"><span>Чӑвашла</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/%C3%9Arodnost" title="Úrodnost – Czech" lang="cs" hreflang="cs" data-title="Úrodnost" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/Frugtbarhed_(jordbund)" title="Frugtbarhed (jordbund) – Danish" lang="da" hreflang="da" data-title="Frugtbarhed (jordbund)" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Bodenfruchtbarkeit" title="Bodenfruchtbarkeit – German" lang="de" hreflang="de" data-title="Bodenfruchtbarkeit" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Mullaviljakus" title="Mullaviljakus – Estonian" lang="et" hreflang="et" data-title="Mullaviljakus" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Fertilidad_del_suelo" title="Fertilidad del suelo – Spanish" lang="es" hreflang="es" data-title="Fertilidad del suelo" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Grundofekundeco" title="Grundofekundeco – Esperanto" lang="eo" hreflang="eo" data-title="Grundofekundeco" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AD%D8%A7%D8%B5%D9%84%D8%AE%DB%8C%D8%B2%DB%8C_%D8%AE%D8%A7%DA%A9" title="حاصلخیزی خاک – Persian" lang="fa" hreflang="fa" data-title="حاصلخیزی خاک" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Fertilit%C3%A9_des_sols" title="Fertilité des sols – French" lang="fr" hreflang="fr" data-title="Fertilité des sols" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%86%A0%EC%96%91%EB%B9%84%EC%98%A5%EB%8F%84" title="토양비옥도 – Korean" lang="ko" hreflang="ko" data-title="토양비옥도" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%80%D5%B8%D5%B2%D5%AB_%D5%A2%D5%A5%D6%80%D6%80%D5%AB%D5%B8%D6%82%D5%A9%D5%B5%D5%B8%D6%82%D5%B6" title="Հողի բերրիություն – Armenian" lang="hy" hreflang="hy" data-title="Հողի բերրիություն" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AE%E0%A5%83%E0%A4%A6%E0%A4%BE_%E0%A4%89%E0%A4%B0%E0%A5%8D%E0%A4%B5%E0%A4%B0%E0%A4%A4%E0%A4%BE" title="मृदा उर्वरता – Hindi" lang="hi" hreflang="hi" data-title="मृदा उर्वरता" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Kesuburan_tanah" title="Kesuburan tanah – Indonesian" lang="id" hreflang="id" data-title="Kesuburan tanah" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Fertilit%C3%A0_(agricoltura)" title="Fertilità (agricoltura) – Italian" lang="it" hreflang="it" data-title="Fertilità (agricoltura)" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%A4%D7%95%D7%A8%D7%99%D7%95%D7%AA_%D7%94%D7%A7%D7%A8%D7%A7%D7%A2" title="פוריות הקרקע – Hebrew" lang="he" hreflang="he" data-title="פוריות הקרקע" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/%D0%9F%D0%BB%D0%BE%D0%B4%D0%BD%D0%BE%D1%81%D1%82_%D0%BD%D0%B0_%D0%BF%D0%BE%D1%87%D0%B2%D0%B0%D1%82%D0%B0" title="Плодност на почвата – Macedonian" lang="mk" hreflang="mk" data-title="Плодност на почвата" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ml mw-list-item"><a href="https://ml.wikipedia.org/wiki/%E0%B4%AE%E0%B4%A3%E0%B5%8D%E0%B4%A3%E0%B4%BF%E0%B4%A8%E0%B5%8D%E0%B4%B1%E0%B5%86_%E0%B4%AB%E0%B4%B2%E0%B4%AD%E0%B5%82%E0%B4%AF%E0%B4%BF%E0%B4%B7%E0%B5%8D%E0%B4%9F%E0%B4%BF" title="മണ്ണിന്റെ ഫലഭൂയിഷ്ടി – Malayalam" lang="ml" hreflang="ml" data-title="മണ്ണിന്റെ ഫലഭൂയിഷ്ടി" data-language-autonym="മലയാളം" data-language-local-name="Malayalam" class="interlanguage-link-target"><span>മലയാളം</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Kesuburan_tanah" title="Kesuburan tanah – Malay" lang="ms" hreflang="ms" data-title="Kesuburan tanah" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-mn mw-list-item"><a href="https://mn.wikipedia.org/wiki/%D0%A5%D3%A9%D1%80%D1%81%D0%BD%D0%B8%D0%B9_%D2%AF%D1%80%D0%B6%D0%B8%D0%BB_%D1%88%D0%B8%D0%BC" title="Хөрсний үржил шим – Mongolian" lang="mn" hreflang="mn" data-title="Хөрсний үржил шим" data-language-autonym="Монгол" data-language-local-name="Mongolian" class="interlanguage-link-target"><span>Монгол</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Bodemvruchtbaarheid" title="Bodemvruchtbaarheid – Dutch" lang="nl" hreflang="nl" data-title="Bodemvruchtbaarheid" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E5%9C%9F%E5%A3%8C%E8%82%A5%E6%B2%83%E5%BA%A6" title="土壌肥沃度 – Japanese" lang="ja" hreflang="ja" data-title="土壌肥沃度" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-uz mw-list-item"><a href="https://uz.wikipedia.org/wiki/Tuproq_unumdorligi" title="Tuproq unumdorligi – Uzbek" lang="uz" hreflang="uz" data-title="Tuproq unumdorligi" data-language-autonym="Oʻzbekcha / ўзбекча" data-language-local-name="Uzbek" class="interlanguage-link-target"><span>Oʻzbekcha / ўзбекча</span></a></li><li class="interlanguage-link interwiki-pa mw-list-item"><a href="https://pa.wikipedia.org/wiki/%E0%A8%AE%E0%A8%BF%E0%A9%B1%E0%A8%9F%E0%A9%80_%E0%A8%A6%E0%A9%80_%E0%A8%89%E0%A8%AA%E0%A8%9C%E0%A8%BE%E0%A8%8A_%E0%A8%B8%E0%A8%BC%E0%A8%95%E0%A8%A4%E0%A9%80" title="ਮਿੱਟੀ ਦੀ ਉਪਜਾਊ ਸ਼ਕਤੀ – Punjabi" lang="pa" hreflang="pa" data-title="ਮਿੱਟੀ ਦੀ ਉਪਜਾਊ ਸ਼ਕਤੀ" data-language-autonym="ਪੰਜਾਬੀ" data-language-local-name="Punjabi" class="interlanguage-link-target"><span>ਪੰਜਾਬੀ</span></a></li><li class="interlanguage-link interwiki-pnb mw-list-item"><a href="https://pnb.wikipedia.org/wiki/%D8%B2%D9%85%DB%8C%D9%86_%D8%AF%DB%8C_%D8%B2%D8%B1%D8%AE%DB%8C%D8%B2%DB%8C" title="زمین دی زرخیزی – Western Punjabi" lang="pnb" hreflang="pnb" data-title="زمین دی زرخیزی" data-language-autonym="پنجابی" data-language-local-name="Western Punjabi" class="interlanguage-link-target"><span>پنجابی</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/%C5%BByzno%C5%9B%C4%87_gleby" title="Żyzność gleby – Polish" lang="pl" hreflang="pl" data-title="Żyzność gleby" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-qu mw-list-item"><a href="https://qu.wikipedia.org/wiki/Puquna" title="Puquna – Quechua" lang="qu" hreflang="qu" data-title="Puquna" data-language-autonym="Runa Simi" data-language-local-name="Quechua" class="interlanguage-link-target"><span>Runa Simi</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%9F%D0%BB%D0%BE%D0%B4%D0%BE%D1%80%D0%BE%D0%B4%D0%B8%D0%B5_%D0%BF%D0%BE%D1%87%D0%B2%D1%8B" title="Плодородие почвы – Russian" lang="ru" hreflang="ru" data-title="Плодородие почвы" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/Plodnost_zemlji%C5%A1ta" title="Plodnost zemljišta – Serbian" lang="sr" hreflang="sr" data-title="Plodnost zemljišta" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Viljavuus" title="Viljavuus – Finnish" lang="fi" hreflang="fi" data-title="Viljavuus" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-kab mw-list-item"><a href="https://kab.wikipedia.org/wiki/Tamsirwa_n_wakal" title="Tamsirwa n wakal – Kabyle" lang="kab" hreflang="kab" data-title="Tamsirwa n wakal" data-language-autonym="Taqbaylit" data-language-local-name="Kabyle" class="interlanguage-link-target"><span>Taqbaylit</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/Toprak_verimlili%C4%9Fi" title="Toprak verimliliği – Turkish" lang="tr" hreflang="tr" data-title="Toprak verimliliği" data-language-autonym="Türkçe" data-language-local-name="Turkish" 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class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Soil_Horizons.svg/330px-Soil_Horizons.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Soil_Horizons.svg/440px-Soil_Horizons.svg.png 2x" data-file-width="512" data-file-height="590" /></a><figcaption>Soil scientists use the capital letters O, A, B, C, and E to identify the master horizons, and lowercase letters for distinctions of these horizons. Most soils have three major horizons—the surface horizon (A), the subsoil (B), and the substratum (C). Some soils have an organic horizon (O) on the surface, but this horizon can also be buried. The master horizon, E, is used for subsurface horizons that have a significant loss of minerals (eluviation). Hard bedrock, which is not soil, uses the letter R.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Desert_East_of_Birdsville_-_panoramio_(3).jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Desert_East_of_Birdsville_-_panoramio_%283%29.jpg/220px-Desert_East_of_Birdsville_-_panoramio_%283%29.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Desert_East_of_Birdsville_-_panoramio_%283%29.jpg/330px-Desert_East_of_Birdsville_-_panoramio_%283%29.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ea/Desert_East_of_Birdsville_-_panoramio_%283%29.jpg/440px-Desert_East_of_Birdsville_-_panoramio_%283%29.jpg 2x" data-file-width="4608" data-file-height="3456" /></a><figcaption>Desert east of <a href="/wiki/Birdsville" title="Birdsville">Birdsville</a>, <a href="/wiki/Australia" title="Australia">Australia</a>. Much of Australia is <a href="/wiki/Population_density" title="Population density">sparsely populated</a> as its desert soils are mostly infertile; thus unable to support larger scale human habitation.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></figcaption></figure> <p><b>Soil fertility</b> refers to the ability of <a href="/wiki/Soil" title="Soil">soil</a> to sustain agricultural <a href="/wiki/Plant_growth" class="mw-redirect" title="Plant growth">plant growth</a>, i.e. to provide plant <a href="/wiki/Habitat" title="Habitat">habitat</a> and result in sustained and consistent <a href="/wiki/Crop_yield" title="Crop yield">yields</a> of high quality.<sup id="cite_ref-Muenster_university_3-0" class="reference"><a href="#cite_note-Muenster_university-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> It also refers to the soil's ability to supply plant/crop nutrients in the right quantities and qualities over a sustained period of time. A fertile soil has the following properties:<sup id="cite_ref-FAO_SoilFertility_4-0" class="reference"><a href="#cite_note-FAO_SoilFertility-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <ul><li>The ability to supply <a href="/wiki/Plant_nutrition" title="Plant nutrition">essential plant nutrients</a> and water in adequate amounts and proportions for plant growth and reproduction; and</li> <li>The absence of <a href="/wiki/Phytotoxicity" title="Phytotoxicity">toxic substances</a> which may inhibit plant growth e.g. Fe<sup>2+</sup> which leads to nutrient toxicity.</li></ul> <p>The following properties contribute to soil fertility in most situations: </p> <ul><li>Sufficient soil depth for adequate root growth and water retention;</li> <li>Good internal <a href="/wiki/Drainage" title="Drainage">drainage</a>, allowing sufficient aeration for optimal root growth (although some plants, such as rice, tolerate waterlogging);</li> <li>Topsoil or horizon O is with sufficient <a href="/wiki/Soil_organic_matter" title="Soil organic matter">soil organic matter</a> for healthy <a href="/wiki/Soil_structure" title="Soil structure">soil structure</a> and <a href="/wiki/Soil_moisture" title="Soil moisture">soil moisture</a> retention;</li> <li><a href="/wiki/Soil_pH" title="Soil pH">Soil pH</a> in the range 5.5 to 7.0 (suitable for most plants but some prefer or tolerate more acid or alkaline conditions);</li> <li>Adequate concentrations of <a href="/wiki/Plant_nutrition" title="Plant nutrition">essential plant nutrients</a> in plant-available forms;</li> <li>Presence of a range of <a href="/wiki/Soil_life" class="mw-redirect" title="Soil life">microorganisms</a> that support plant growth.</li></ul> <p>In lands used for <a href="/wiki/Agriculture" title="Agriculture">agriculture</a> and other human activities, maintenance of soil fertility typically requires the use of <a href="/wiki/Soil_conservation" title="Soil conservation">soil conservation</a> practices. This is because <a href="/wiki/Soil_erosion" title="Soil erosion">soil erosion</a> and other forms of <a href="/wiki/Soil_degradation" class="mw-redirect" title="Soil degradation">soil degradation</a> generally result in a decline in quality with respect to one or more of the aspects indicated above. </p><p>Soil fertility and quality of land have been impacted by the effects of colonialism and slavery both in the U.S. and globally. The introduction of harmful land practices such as intensive and non-prescribed burnings and deforestation by colonists created long-lasting negative results to the environment. </p><p>Soil fertility and depletion have different origins and consequences in various parts of the world. The intentional creation of dark earth in the Amazon promotes the important relationship between indigenous communities and their land. In African and Middle Eastern regions, humans and the environment are also altered due to soil depletion. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Soil_fertilization">Soil fertilization</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=1" title="Edit section: Soil fertilization"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Fertilizer" title="Fertilizer">Fertilizer</a></div> <p><a href="/wiki/Bioavailability" title="Bioavailability">Bioavailable</a> phosphorus (available to soil life) is the element in soil that is most often lacking. Nitrogen and potassium are also needed in substantial amounts. For this reason these three elements are always identified on a commercial fertilizer analysis. For example, a 10-10-15 fertilizer has 10 percent nitrogen, 10 percent available phosphorus (P<sub>2</sub>O<sub>5</sub>) and 15 percent water-soluble potassium (K<sub>2</sub>O). Sulfur is the fourth element that may be identified in a commercial analysis—e.g. 21-0-0-24 which would contain 21% nitrogen and 24% sulfate. </p><p>Inorganic fertilizers are generally less expensive and have higher concentrations of nutrients than organic fertilizers. Also, since nitrogen, phosphorus and potassium generally must be in the inorganic forms to be taken up by plants, inorganic fertilizers are generally immediately bioavailable to plants without modification.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> However, studies suggest that chemical fertilizers have adverse health impacts on humans including the development of chronic disease from the toxins.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> As for the environment, over-reliance on inorganic fertilizers disrupts the natural nutrient balance in the soil, resulting in lower soil quality, loss of organic matter, and higher chances for erosion in the soil.<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>Additionally, the water-soluble nitrogen in inorganic fertilizers does not provide for the long-term needs of the plant and creates water pollution. Slow-release fertilizers may reduce leaching loss of nutrients and may make the nutrients that they provide available over a longer period of time. </p><p>Soil fertility is a complex process that involves the constant cycling of nutrients between organic and inorganic forms. As plant material and animal wastes are decomposed by micro-organisms, they release inorganic nutrients to the soil solution, a process referred to as <a href="/wiki/Mineralization_(soil_science)" title="Mineralization (soil science)">mineralization</a>. Those nutrients may then undergo further transformations which may be aided or enabled by soil micro-organisms. Like plants, many micro-organisms require or preferentially use inorganic forms of nitrogen, phosphorus or potassium and will compete with plants for these nutrients, tying up the nutrients in microbial <a href="/wiki/Biomass" title="Biomass">biomass</a>, a process often called <a href="/wiki/Immobilization_(soil_science)" title="Immobilization (soil science)">immobilization</a>. The balance between immobilization and mineralization processes depends on the balance and availability of major nutrients and organic carbon to soil microorganisms.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> Natural processes such as lightning strikes may fix atmospheric nitrogen by converting it to (NO<sub>2</sub>). Denitrification may occur under anaerobic conditions (flooding) in the presence of denitrifying bacteria. Nutrient cations, including potassium and many micronutrients, are held in relatively strong bonds with the negatively charged portions of the soil in a process known as <a href="/wiki/Cation-exchange_capacity" title="Cation-exchange capacity">cation exchange</a>. </p><p>Phosphorus is a primary factor of soil fertility as it is an element of plant nutrients in the soil. It is essential for cell division and plant development, especially in seedlings and young plants.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> However, phosphorus is becoming increasingly harder to find and its reserves are starting to be depleted due to the excessive use as a fertilizer. The widespread use of phosphorus in fertilizers has led to pollution and <a href="/wiki/Eutrophication" title="Eutrophication">eutrophication</a>.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> Recently the term <a href="/wiki/Peak_phosphorus" class="mw-redirect" title="Peak phosphorus">peak phosphorus</a> has been coined, due to the limited occurrence of rock phosphate in the world. </p><p>A wide variety of materials have been described as <a href="/wiki/Soil_conditioner" title="Soil conditioner">soil conditioners</a> due to their ability to improve <a href="/wiki/Soil_quality" title="Soil quality">soil quality</a>, including <a href="/wiki/Biochar" title="Biochar">biochar</a>, offering multiple <a href="/wiki/Soil_health" title="Soil health">soil health</a> benefits.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> </p><p><a href="/wiki/Food_loss_and_waste" title="Food loss and waste">Food waste</a> <a href="/wiki/Compost" title="Compost">compost</a> was found to have better soil improvement than <a href="/wiki/Manure" title="Manure">manure</a> based compost.<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Light_and_CO2_limitations">Light and CO<sub>2</sub> limitations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=2" title="Edit section: Light and CO2 limitations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Photosynthesis" title="Photosynthesis">Photosynthesis</a> is the process whereby plants use light energy to drive chemical reactions which convert CO<sub>2</sub> into sugars. As such, all plants require access to both light and carbon dioxide to produce energy, grow and reproduce. </p><p>While typically limited by nitrogen, phosphorus and potassium, low levels of carbon dioxide can also act as a limiting factor on plant growth. Peer-reviewed and published scientific studies have shown that increasing CO<sub>2</sub> is highly effective at promoting plant growth up to levels over 300 ppm. Further increases in CO<sub>2</sub> can, to a very small degree, continue to increase net photosynthetic output.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Soil_depletion">Soil depletion</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=3" title="Edit section: Soil depletion"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Soil depletion occurs when the components which contribute to fertility are removed and not replaced, and the conditions which support soil's fertility are not maintained. This leads to poor crop yields. In agriculture, depletion can be due to excessively intense cultivation and inadequate <a href="/wiki/Soil_management" title="Soil management">soil management</a>. Depletion may occur through a variety of other effects, including overtillage (which damages soil structure), underuse of nutrient inputs which leads to mining of the soil nutrient bank, and <a href="/wiki/Soil_salinity" title="Soil salinity">salinization</a> of soil. </p> <div class="mw-heading mw-heading3"><h3 id="Colonial_Impacts_on_Soil_Depletion">Colonial Impacts on Soil Depletion</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=4" title="Edit section: Colonial Impacts on Soil Depletion"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Soil fertility can be severely challenged when <a href="/wiki/Land-use_change" class="mw-redirect" title="Land-use change">land-use changes</a> rapidly. For example, in <a href="/wiki/Colonial_New_England" class="mw-redirect" title="Colonial New England">Colonial New England</a>, colonists made a number of decisions that depleted the soils, including: allowing herd animals to wander freely, not replenishing soils with manure, and a sequence of events that led to erosion.<sup id="cite_ref-Cronon_15-0" class="reference"><a href="#cite_note-Cronon-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> <a href="/wiki/William_Cronon" title="William Cronon">William Cronon</a> wrote that "...the long-term effect was to put those soils in jeopardy. The removal of the forest, the increase in destructive floods, the soil compaction and close-cropping wrought by grazing animals, ploughing—all served to increase erosion." Cronon continues, explaining, “Where mowing was unnecessary and grazing among living trees was possible, settlers saved labor by simply burning the forest undergrowth...and turning loose their cattle...In at least one ill-favored area, the inhabitants of neighboring towns burned so frequently and graze so intensively that…the timber was greatly injured, and the land became hard to subdue...In the long run, cattle tended to encourage the growth of woody, thorn-bearing plants which they could not eat and which, once established, were very difficult to remove”. These practices were methods of simplifying labor for colonial settlers in new lands when they were not familiar with traditional Indigenous agricultural methods. Those Indigenous communities were not consulted but rather forced out of their homelands so European settlers could commodify their resources. The practice of intensive land burning and turning loose cattle ruined soil fertility and prohibited sustainable crop growth.<sup id="cite_ref-Cronon_15-1" class="reference"><a href="#cite_note-Cronon-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p><p>While colonists utilized fire to clear land, certain prescribed burning practices are common and valuable to increase biodiversity and in turn, benefit soil fertility. Without consideration of the intensity, seasonality, and frequency of the burns, the conservation of biodiversity and the overall health of the soil can be negatively impacted by fire.<sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> </p><p>In addition to soil erosion through using too much or too little fire, colonial agriculture also resulted in topsoil depletion. Topsoil depletion occurs when the nutrient-rich organic <a href="/wiki/Topsoil" title="Topsoil">topsoil</a>, which takes hundreds to thousands of years to build up under natural conditions, is eroded or depleted of its original organic material.<sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> The Dust Bowl in the <a href="/wiki/Great_Plains" title="Great Plains">Great Plains</a> of North America is a great example of this with about one-half of the original topsoil of the great plains having disappeared since the beginning of agricultural production there in the 1880s. Outside of the context of colonialism topsoil depletion can historically be attributed to many past civilizations' collapses.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Soil_Depletion_and_Enslavement">Soil Depletion and Enslavement</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=5" title="Edit section: Soil Depletion and Enslavement"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>As historian David Silkenat explains, the goals of Southern plantation and slave owners, instead of measuring productivity based on outputs per acre, were to maximize the amount of labor that could be extracted from the enslaved workforce. The landscape was seen as disposable, and the African slaves were seen as expendable. Once these Southern farmers forced slaves to leach soils and engage in mass deforestation, they would discard the land and move towards more fertile prospects. The forced slave practices created extensive destruction on the land. The environmental impact included draining swamps, clearing forests for monocropping and fuel steamships, and introducing invasive species, all leading to fragile ecosystems. In the aftermath, these ecosystems left hillsides eroded, rivers clogged with sterile soil, and extinction of native species. Silkenat summarizes this phenomenon of the relationship between enslavement and soil, “Although typically treated separately, slavery and the environment naturally intersect in complex and powerful ways, leaving lasting effects from the period of emancipation through modern-day reckonings with racial justice…the land too fell victim to the slave owner’s lash”.<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Global_Soil_Depletion">Global Soil Depletion</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=6" title="Edit section: Global Soil Depletion"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>One of the most widespread occurrences of soil depletion as of 2008<sup class="plainlinks noexcerpt noprint asof-tag update" style="display:none;"><a class="external text" href="https://en.wikipedia.org/w/index.php?title=Soil_fertility&action=edit">[update]</a></sup> is in tropical zones where nutrient content of soils is low. The depletion of soil has affected the state of plant life and crops in agriculture in many countries. In the Middle East for example, many countries find it difficult to grow produce because of droughts, lack of soil, and lack of irrigation. The <a href="/wiki/Middle_East" title="Middle East">Middle East</a> has three countries that indicate a decline in crop production, the highest rates of productivity decline are found in hilly and dryland areas.<sup id="cite_ref-20" class="reference"><a href="#cite_note-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> </p><p>Many countries in Africa also undergo a depletion of fertile soil. In regions of dry climate like <a href="/wiki/Sudan" title="Sudan">Sudan</a> and the countries that make up the <a href="/wiki/Sahara_Desert" class="mw-redirect" title="Sahara Desert">Sahara Desert</a>, droughts and soil degradation is common. Cash crops such as teas, maize, and beans require a variety of nutrients in order to grow healthy. Soil fertility has declined in the farming regions of Africa and the use of artificial and natural fertilizers has been used to regain the nutrients of ground soil.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Dark_Earths">Dark Earths</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=7" title="Edit section: Dark Earths"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="South_America">South America</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=8" title="Edit section: South America"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The details of Indigenous societies prior to European colonization in 1492 within the Amazonian regions of South America, particularly the size of the communities and the depth of interactions with the environment, are continually debated. Central to the debate is the influence of Dark Earth. Dark Earth is a type of soil found in the Amazon that has a darker color, higher organic carbon content, and higher fertility than soil in other regions of South America which makes it highly coveted even today. Dark Earth deposits have been found, through ethnographic and archaeological studies, to have been created through ancient Indigenous practices by intentional soil management.<sup id="cite_ref-:0_22-0" class="reference"><a href="#cite_note-:0-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p><p>Ethnoarchaeologist Morgan Schmidt outlines how this carbon-rich soil was intentionally created by communities in the Amazon. While Dark Earth, and other anthropic soils, can be found all throughout the world, Amazonian Dark Earth is particularly significant because “it contrasts too sharply with the especially poor fertility of typical highly weathered tropical upland soils in the Amazon”. There is much evidence to suggest that the development of ancient agricultural societies in the Amazon was strongly influenced by the formation of Dark Earth. As a result, Amazonian societies benefitted from the dark earth in terms of agricultural success and enhanced food production. Soil analyses have been completed on the modern and ancient Kuikuro Indigenous Territory in the Upper Xingu River basin in southeastern Amazonia through archaeological and ethnographic research to determine the human relation to the soil. The “results demonstrate the intentional creation of dark earth, highlighting how Indigenous knowledge can provide strategies for sustainable rainforest management”.<sup id="cite_ref-:0_22-1" class="reference"><a href="#cite_note-:0-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Africa">Africa</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=9" title="Edit section: Africa"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In Egypt, earthworms of the Nile River Valley contributed to the significant fertility of the soils. As a result, Cleopatra declared the earthworm and sacred animal to recognize the animal’s positive impact. No one, including farmers, was “allowed to harm or remove an earthworm for fear of offending the deity of fertility”.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (November 2024)">citation needed</span></a></i>]</sup> In Ghana and Liberia, it is a long-withstanding practice to combine different types of waste to create fertile soil that is referred to as African Dark Earths. This soil, contains high concentrations of calcium, phosphorus, and carbon.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Humans_and_Soil">Humans and Soil</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=10" title="Edit section: Humans and Soil"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Albert Howard is credited as the first Westerner to publish Native techniques of sustainable agriculture. As noted by Howard in 1944, “In all future studies of disease we must, therefore, always begin with the soil. This must be gotten into good condition first of all and then the reaction of the soil, the plant, animal, and man observed. Many diseases will then automatically disappear...Soil fertility is the basis of the public health system of the future...”. Howard connects the health crises of crops to the impacts of livestock and human health, ultimately spreading the message that humans must respect and restore the soil for the benefit of the human and non-human world. He continues that industrial agriculture disrupts the delicate balance of nature and irrevocably robs the soil of its fertility.<sup id="cite_ref-24" class="reference"><a href="#cite_note-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Irrigation_effects">Irrigation effects</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=11" title="Edit section: Irrigation effects"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Irrigation" title="Irrigation">Irrigation</a> is a process by which crops are watered by man-made means, such as bringing in water from pipes, canals, or sprinklers. Irrigation is used when the natural rainfall patterns of a region are not sustainable enough to maintain crops. Ancient civilizations heavily relied on irrigation and today about 18% of the world's cropland is irrigated.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> The quality of irrigation water is very important to maintain soil fertility and <a href="/wiki/Tilth" title="Tilth">tilth</a>, and for using more soil depth by the plants.<sup id="cite_ref-Colorado_state_university_26-0" class="reference"><a href="#cite_note-Colorado_state_university-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup> When soil is irrigated with high alkaline water, unwanted sodium salts build up in the soil which would make soil draining capacity very poor. So plant roots can not penetrate deep into the soil for optimum growth in <a href="/wiki/Alkali_soils" class="mw-redirect" title="Alkali soils">Alkali soils</a>. When soil is <a href="/wiki/Environmental_impact_of_irrigation" title="Environmental impact of irrigation">irrigated with low pH / acidic water</a>, the useful salts (Ca, Mg, K, P, S, etc.) are removed by draining water from the <a href="/wiki/Soil_pH" title="Soil pH">acidic soil</a> and in addition unwanted aluminium and manganese salts to the plants are dissolved from the soil impeding plant growth.<sup id="cite_ref-oregonstateedu_27-0" class="reference"><a href="#cite_note-oregonstateedu-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> When soil is irrigated with high <a href="/wiki/Salinity" title="Salinity">salinity</a> water or sufficient water is not draining out from the irrigated soil, the soil would convert into <a href="/wiki/Soil_salinity_control" title="Soil salinity control">saline soil</a> or lose its fertility. Saline water enhance the <a href="/wiki/Turgor_pressure" title="Turgor pressure">turgor pressure</a> or <a href="/wiki/Osmotic_pressure" title="Osmotic pressure">osmotic pressure</a> requirement which impedes the off take of water and nutrients by the plant roots. </p><p>Top soil loss takes place in alkali soils due to erosion by rain water surface flows or drainage as they form colloids (fine mud) in contact with water. Plants absorb water-soluble inorganic salts only from the soil for their growth. Soil as such does not lose fertility just by growing crops but it lose its fertility due to accumulation of unwanted and depletion of wanted inorganic salts from the soil by improper irrigation and acid rain water (quantity and quality of water). The fertility of many soils which are not suitable for plant growth can be enhanced many times gradually by providing adequate irrigation water of suitable quality and good drainage from the soil. </p> <div class="mw-heading mw-heading2"><h2 id="Global_distribution">Global distribution</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=12" title="Edit section: Global distribution"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-center" typeof="mw:File/Thumb"><a href="/wiki/File:Global_soils_map_USDA.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Global_soils_map_USDA.jpg/600px-Global_soils_map_USDA.jpg" decoding="async" width="600" height="465" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Global_soils_map_USDA.jpg/900px-Global_soils_map_USDA.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Global_soils_map_USDA.jpg/1200px-Global_soils_map_USDA.jpg 2x" data-file-width="6165" data-file-height="4780" /></a><figcaption>Global distribution of soil types of the <a href="/wiki/USDA_soil_taxonomy" title="USDA soil taxonomy">USDA soil taxonomy</a> system. <a href="/wiki/Mollisols" class="mw-redirect" title="Mollisols">Mollisols</a>, shown here in dark green, are a good (though not the only) indicator of high soil fertility. They coincide to a large extent with the world's major grain producing areas like the North American <a href="/wiki/Prairie" title="Prairie">Prairie</a> States, the <a href="/wiki/Pampa" class="mw-redirect" title="Pampa">Pampa</a> and <a href="/wiki/Gran_Chaco" title="Gran Chaco">Gran Chaco</a> of South America and the <a href="/wiki/Ukraine" title="Ukraine">Ukraine</a>-to-Central Asia <a href="/wiki/Chernozem" title="Chernozem">Black Earth</a> belt.</figcaption></figure> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=13" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Arable_land" title="Arable land">Arable land</a></li> <li><a href="/wiki/Plaggen_soil" title="Plaggen soil">Plaggen soil</a></li> <li><a href="/wiki/Shifting_cultivation" title="Shifting cultivation">Shifting cultivation</a></li> <li><a href="/wiki/Soil_contamination" title="Soil contamination">Soil contamination</a></li> <li><a href="/wiki/Soil_life" class="mw-redirect" title="Soil life">Soil life</a></li> <li><a href="/wiki/Terra_preta" title="Terra preta">Terra preta</a></li> <li><a href="/wiki/Cation-exchange_capacity" title="Cation-exchange capacity">Cation-exchange capacity</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Soil_fertility&action=edit&section=14" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFKelly1995" class="citation web cs1">Kelly, Karina (13 September 1995). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20100113095438/http://www.abc.net.au/quantum/info/q95-19-5.htm">"A Chat with Tim Flannery on Population Control"</a>. <a href="/wiki/Australian_Broadcasting_Corporation" title="Australian Broadcasting Corporation">Australian Broadcasting Corporation</a>. Archived from <a rel="nofollow" class="external text" href="http://www.abc.net.au/quantum/info/q95-19-5.htm">the original</a> on 13 January 2010<span class="reference-accessdate">. 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href="/wiki/Template_talk:Soil_science_topics" title="Template talk:Soil science topics"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Soil_science_topics" title="Special:EditPage/Template:Soil science topics"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Soil_science" style="font-size:114%;margin:0 4em"><a href="/wiki/Soil_science" title="Soil science">Soil science</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><a href="/wiki/History_of_soil_science" title="History of soil science">History</a></li> <li><a href="/wiki/Index_of_soil-related_articles" title="Index of soil-related articles">Index</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Main fields</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pedology" title="Pedology">Pedology</a></li> <li><a href="/wiki/Edaphology" title="Edaphology">Edaphology</a></li> <li><a href="/wiki/Soil_biology" title="Soil biology">Soil biology</a></li> <li><a href="/wiki/Soil_microbiology" title="Soil microbiology">Soil microbiology</a></li> <li><a href="/wiki/Soil_zoology" title="Soil zoology">Soil zoology</a></li> <li><a href="/wiki/Soil_ecology" title="Soil ecology">Soil ecology</a></li> <li><a href="/wiki/Soil_physics" title="Soil physics">Soil physics</a></li> <li><a href="/wiki/Soil_mechanics" title="Soil mechanics">Soil mechanics</a></li> <li><a href="/wiki/Soil_chemistry" title="Soil chemistry">Soil chemistry</a></li> <li><a href="/wiki/Environmental_soil_science" title="Environmental soil science">Environmental soil science</a></li> <li><a href="/wiki/Agricultural_soil_science" title="Agricultural soil science">Agricultural soil science</a></li></ul> </div></td><td class="noviewer navbox-image" rowspan="8" style="width:1px;padding:0 0 0 2px"><div><span class="mw-image-border" typeof="mw:File"><a href="/wiki/File:Soil_profile.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Soil_profile.svg/110px-Soil_profile.svg.png" decoding="async" width="110" height="159" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Soil_profile.svg/165px-Soil_profile.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Soil_profile.svg/220px-Soil_profile.svg.png 2x" data-file-width="456" data-file-height="660" /></a></span></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Soil topics</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Soil" title="Soil">Soil</a></li> <li><a href="/wiki/Pedosphere" title="Pedosphere">Pedosphere</a> <ul><li><a href="/wiki/Soil_morphology" title="Soil morphology">Soil morphology</a></li> <li><a href="/wiki/Pedodiversity" title="Pedodiversity">Pedodiversity</a></li> <li><a href="/wiki/Soil_formation" title="Soil formation">Soil formation</a></li></ul></li> <li><a href="/wiki/Soil_erosion" title="Soil erosion">Soil erosion</a></li> <li><a href="/wiki/Soil_contamination" title="Soil contamination">Soil contamination</a></li> <li><a href="/wiki/Soil_retrogression_and_degradation" title="Soil retrogression and degradation">Soil retrogression and degradation</a></li> <li><a href="/wiki/Soil_compaction" title="Soil compaction">Soil compaction</a> <ul><li><a href="/wiki/Soil_compaction_(agriculture)" title="Soil compaction (agriculture)">Soil compaction (agriculture)</a></li></ul></li> <li><a href="/wiki/Soil_sealing" title="Soil sealing">Soil sealing</a></li> <li><a href="/wiki/Soil_salinity" title="Soil salinity">Soil salinity</a> <ul><li><a href="/wiki/Alkali_soil" title="Alkali soil">Alkali soil</a></li></ul></li> <li><a href="/wiki/Soil_pH" title="Soil pH">Soil pH</a> <ul><li><a href="/wiki/Soil_acidification" title="Soil acidification">Soil acidification</a></li></ul></li> <li><a href="/wiki/Soil_health" title="Soil health">Soil health</a></li> <li><a href="/wiki/Soil_life" class="mw-redirect" title="Soil life">Soil life</a></li> <li><a href="/wiki/Soil_biodiversity" title="Soil biodiversity">Soil biodiversity</a></li> <li><a href="/wiki/Soil_quality" title="Soil quality">Soil quality</a></li> <li><a href="/wiki/Soil_value" title="Soil value">Soil value</a></li> <li><a class="mw-selflink selflink">Soil fertility</a></li> <li><a href="/wiki/Soil_resilience" title="Soil resilience">Soil resilience</a></li> <li><a href="/wiki/Soil_color" title="Soil color">Soil color</a></li> <li><a href="/wiki/Soil_texture" title="Soil texture">Soil texture</a></li> <li><a href="/wiki/Soil_structure" title="Soil structure">Soil structure</a> <ul><li><a href="/wiki/Pore_space_in_soil" title="Pore space in soil">Pore space in soil</a></li> <li><a href="/wiki/Pore_water_pressure" title="Pore water pressure">Pore water pressure</a></li></ul></li> <li><a href="/wiki/Soil_crust" title="Soil crust">Soil crust</a></li> <li><a href="/wiki/Soil_horizon" title="Soil horizon">Soil horizon</a></li> <li><a href="/wiki/Soil_biomantle" title="Soil biomantle">Soil biomantle</a></li> <li><a href="/wiki/Soil_carbon" title="Soil carbon">Soil carbon</a></li> <li><a href="/wiki/Soil_gas" title="Soil gas">Soil gas</a> <ul><li><a href="/wiki/Soil_respiration" title="Soil respiration">Soil respiration</a></li></ul></li> <li><a href="/wiki/Soil_organic_matter" title="Soil organic matter">Soil organic matter</a></li> <li><a href="/wiki/Soil_moisture" title="Soil moisture">Soil moisture</a> <ul><li><a href="/wiki/Soil_water_(retention)" title="Soil water (retention)">Soil water (retention)</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Soil_type" title="Soil type">Soil type</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><div class="navbox-styles"></div><div role="navigation" class="navbox" aria-labelledby="Soil_classification" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Soil_type" title="Template:Soil type"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Soil_type" title="Template talk:Soil type"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Soil_type" title="Special:EditPage/Template:Soil type"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Soil_classification" style="font-size:114%;margin:0 4em"><a href="/wiki/Soil_classification" title="Soil classification">Soil classification</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/World_Reference_Base_for_Soil_Resources" title="World Reference Base for Soil Resources">World Reference Base<br /> for Soil Resources</a> (1998–)</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acrisol" title="Acrisol">Acrisols</a></li> <li><a href="/wiki/Alisols" class="mw-redirect" title="Alisols">Alisols</a></li> <li><a href="/wiki/Andosol" title="Andosol">Andosols</a></li> <li><a href="/wiki/Anthrosol" title="Anthrosol">Anthrosols</a></li> <li><a href="/wiki/Psamment" title="Psamment">Arenosols</a></li> <li><a href="/wiki/Calcisol" title="Calcisol">Calcisols</a></li> <li><a href="/wiki/Cambisol" title="Cambisol">Cambisols</a></li> <li><a href="/wiki/Chernozem" title="Chernozem">Chernozem</a></li> <li><a href="/wiki/Cryosols" class="mw-redirect" title="Cryosols">Cryosols</a></li> <li><a href="/wiki/Durisol" title="Durisol">Durisols</a></li> <li><a href="/wiki/Ferralsols" class="mw-redirect" title="Ferralsols">Ferralsols</a></li> <li><a href="/wiki/Fluvisol" title="Fluvisol">Fluvisols</a></li> <li><a href="/wiki/Gleysol" title="Gleysol">Gleysols</a></li> <li><a href="/wiki/Gypsisols" class="mw-redirect" title="Gypsisols">Gypsisols</a></li> <li><a href="/wiki/Histosol" title="Histosol">Histosol</a></li> <li><a href="/wiki/Kastanozem" title="Kastanozem">Kastanozems</a></li> <li><a href="/wiki/Leptosol" title="Leptosol">Leptosols</a></li> <li><a href="/wiki/Lixisol" title="Lixisol">Lixisols</a></li> <li><a href="/wiki/Luvisol" title="Luvisol">Luvisols</a></li> <li><a href="/wiki/Nitisol" title="Nitisol">Nitisols</a></li> <li><a href="/wiki/Phaeozem" title="Phaeozem">Phaeozems</a></li> <li><a href="/wiki/Planosol" title="Planosol">Planosols</a></li> <li><a href="/wiki/Plinthosol" title="Plinthosol">Plinthosols</a></li> <li><a href="/wiki/Podzol" title="Podzol">Podzols</a></li> <li><a href="/wiki/Regosol" title="Regosol">Regosols</a></li> <li><a href="/wiki/Retisol" title="Retisol">Retisols</a></li> <li><a href="/wiki/Solonchak" title="Solonchak">Solonchaks</a></li> <li><a href="/wiki/Solonetz" title="Solonetz">Solonetz</a></li> <li><a href="/wiki/Stagnosol" title="Stagnosol">Stagnosol</a></li> <li><a href="/wiki/Technosol" title="Technosol">Technosols</a></li> <li><a href="/wiki/Umbrisol" title="Umbrisol">Umbrisols</a></li> <li><a href="/wiki/Vertisol" title="Vertisol">Vertisols</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/USDA_soil_taxonomy" title="USDA soil taxonomy">USDA soil taxonomy</a></th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alfisol" title="Alfisol">Alfisols</a></li> <li><a href="/wiki/Andisol" title="Andisol">Andisols</a></li> <li><a href="/wiki/Aridisol" title="Aridisol">Aridisols</a></li> <li><a href="/wiki/Entisol" title="Entisol">Entisols</a></li> <li><a href="/wiki/Gelisol" title="Gelisol">Gelisols</a></li> <li><a href="/wiki/Histosol" title="Histosol">Histosols</a></li> <li><a href="/wiki/Inceptisol" title="Inceptisol">Inceptisols</a></li> <li><a href="/wiki/Mollisol" title="Mollisol">Mollisols</a></li> <li><a href="/wiki/Oxisol" title="Oxisol">Oxisols</a></li> <li><a href="/wiki/Podzol" title="Podzol">Spodosols</a></li> <li><a href="/wiki/Ultisol" title="Ultisol">Ultisols</a></li> <li><a href="/wiki/Vertisol" title="Vertisol">Vertisols</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other systems</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/FAO_soil_classification" title="FAO soil classification">FAO soil classification</a> (1974–1998)</li> <li><a href="/wiki/Unified_Soil_Classification_System" title="Unified Soil Classification System">Unified Soil Classification System</a></li> <li><a href="/wiki/AASHTO_Soil_Classification_System" title="AASHTO Soil Classification System">AASHTO Soil Classification System</a></li> <li><a href="/wiki/R%C3%A9f%C3%A9rentiel_p%C3%A9dologique" title="Référentiel pédologique">Référentiel pédologique</a> (French classification system)</li> <li><a href="/wiki/Canadian_system_of_soil_classification" title="Canadian system of soil classification">Canadian system of soil classification</a></li> <li><a href="/wiki/Australian_Soil_Classification" title="Australian Soil Classification">Australian Soil Classification</a></li> <li><a href="/wiki/Polish_Soil_Classification" title="Polish Soil Classification">Polish Soil Classification</a></li> <li><a href="/wiki/1938_USDA_soil_taxonomy" title="1938 USDA soil taxonomy">1938 USDA soil taxonomy</a></li> <li><a href="/wiki/List_of_U.S._state_soils" title="List of U.S. state soils">List of U.S. state soils</a></li> <li><a href="/wiki/List_of_vineyard_soil_types" title="List of vineyard soil types">List of vineyard soil types</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Non-systematic soil types</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Sand" title="Sand">Sand</a></li> <li><a href="/wiki/Silt" title="Silt">Silt</a></li> <li><a href="/wiki/Clay" title="Clay">Clay</a></li> <li><a href="/wiki/Loam" title="Loam">Loam</a></li> <li><a href="/wiki/Topsoil" title="Topsoil">Topsoil</a></li> <li><a href="/wiki/Subsoil" title="Subsoil">Subsoil</a></li> <li><a href="/wiki/Soil_crust" title="Soil crust">Soil crust</a></li> <li><a href="/wiki/Claypan" title="Claypan">Claypan</a></li> <li><a href="/wiki/Hardpan" title="Hardpan">Hardpan</a></li> <li><a href="/wiki/Gypcrust" title="Gypcrust">Gypcrust</a></li> <li><a href="/wiki/Caliche" title="Caliche">Caliche</a></li> <li><a href="/wiki/Parent_material" title="Parent material">Parent material</a></li> <li><a href="/wiki/Pedosphere" title="Pedosphere">Pedosphere</a></li> <li><a href="/wiki/Laimosphere" title="Laimosphere">Laimosphere</a></li> <li><a href="/wiki/Rhizosphere" title="Rhizosphere">Rhizosphere</a></li> <li><a href="/wiki/Bulk_soil" title="Bulk soil">Bulk soil</a></li> <li><a href="/wiki/Alkali_soil" title="Alkali soil">Alkali soil</a></li> <li><a href="/wiki/Bay_mud" title="Bay mud">Bay mud</a></li> <li><a href="/wiki/Blue_goo" title="Blue goo">Blue goo</a></li> <li><a href="/wiki/Brickearth" title="Brickearth">Brickearth</a></li> <li><a href="/wiki/Brown_earth" title="Brown earth">Brown earth</a></li> <li><a href="/wiki/Calcareous_grassland" title="Calcareous grassland">Calcareous grassland</a></li> <li><a href="/wiki/Dark_earth" title="Dark earth">Dark earth</a></li> <li><a href="/wiki/Dry_quicksand" title="Dry quicksand">Dry quicksand</a></li> <li><a href="/wiki/Duplex_soil" title="Duplex soil">Duplex soil</a></li> <li><a href="/wiki/Eluvium" title="Eluvium">Eluvium</a></li> <li><a href="/wiki/Expansive_clay" title="Expansive clay">Expansive clay</a></li> <li><a href="/wiki/Fill_dirt" title="Fill dirt">Fill dirt</a></li> <li><a href="/wiki/Fuller%27s_earth" title="Fuller's earth">Fuller's earth</a></li> <li><a href="/wiki/Hydrophobic_soil" title="Hydrophobic soil">Hydrophobic soil</a></li> <li><a href="/wiki/Loess" title="Loess">Loess</a></li> <li><a href="/wiki/Lunar_soil" class="mw-redirect" title="Lunar soil">Lunar soil</a></li> <li><a href="/wiki/Martian_soil" class="mw-redirect" title="Martian soil">Martian soil</a></li> <li><a href="/wiki/Mud" title="Mud">Mud</a></li> <li><a href="/wiki/Muskeg" title="Muskeg">Muskeg</a></li> <li><a href="/wiki/Paleosol" title="Paleosol">Paleosol</a></li> <li><a href="/wiki/Peat" title="Peat">Peat</a></li> <li><a href="/wiki/Prime_farmland" title="Prime farmland">Prime farmland</a></li> <li><a href="/wiki/Quicksand" title="Quicksand">Quicksand</a></li> <li><a href="/wiki/Serpentine_soil" title="Serpentine soil">Serpentine soil</a></li> <li><a href="/wiki/Spodic_soil" class="mw-redirect" title="Spodic soil">Spodic soil</a></li> <li><a href="/wiki/Stagnogley" title="Stagnogley">Stagnogley</a></li> <li><a href="/wiki/Subaqueous_soil" title="Subaqueous soil">Subaqueous soil</a></li> <li><a href="/wiki/Takir_(soil)" title="Takir (soil)">Takir</a></li> <li><a href="/wiki/Terra_preta" title="Terra preta">Terra preta</a></li> <li><a href="/wiki/Terra_rossa_(soil)" title="Terra rossa (soil)">Terra rossa</a></li> <li><a href="/wiki/Tropical_peat" title="Tropical peat">Tropical peat</a></li> <li><a href="/wiki/Yedoma" title="Yedoma">Yedoma</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Types_of_soil" title="Category:Types of soil">Types of soil</a></div></td></tr></tbody></table></div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Applications</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Soil_conservation" title="Soil conservation">Soil conservation</a></li> <li><a href="/wiki/Soil_management" title="Soil management">Soil management</a></li> <li><a href="/wiki/Soil_guideline_value" title="Soil guideline value">Soil guideline value</a></li> <li><a href="/wiki/Soil_survey" title="Soil survey">Soil survey</a></li> <li><a href="/wiki/Soil_test" title="Soil test">Soil test</a></li> <li><a href="/wiki/Soil_governance" title="Soil governance">Soil governance</a></li> <li><a href="/wiki/Soil_value" title="Soil value">Soil value</a></li> <li><a href="/wiki/Soil_salinity_control" title="Soil salinity control">Soil salinity control</a></li> <li><a href="/wiki/Erosion_control" title="Erosion control">Erosion control</a></li> <li><a href="/wiki/Agroecology" title="Agroecology">Agroecology</a></li> <li><a href="/wiki/Liming_(soil)" title="Liming (soil)">Liming (soil)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related fields</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Geology" title="Geology">Geology</a></li> <li><a href="/wiki/Geochemistry" title="Geochemistry">Geochemistry</a></li> <li><a href="/wiki/Petrology" title="Petrology">Petrology</a></li> <li><a href="/wiki/Geomorphology" title="Geomorphology">Geomorphology</a></li> <li><a href="/wiki/Geotechnical_engineering" title="Geotechnical engineering">Geotechnical engineering</a></li> <li><a href="/wiki/Hydrology" title="Hydrology">Hydrology</a></li> <li><a href="/wiki/Hydrogeology" title="Hydrogeology">Hydrogeology</a></li> <li><a href="/wiki/Biogeography" title="Biogeography">Biogeography</a></li> <li><a href="/wiki/Earth_materials" title="Earth materials">Earth materials</a></li> <li><a href="/wiki/Archaeology" title="Archaeology">Archaeology</a></li> <li><a href="/wiki/Agricultural_science" title="Agricultural science">Agricultural science</a> <ul><li><a href="/wiki/Agrology" class="mw-redirect" title="Agrology">Agrology</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Societies, Initiatives</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Australian_Society_of_Soil_Science_Incorporated" title="Australian Society of Soil Science Incorporated">Australian Society of Soil Science Incorporated</a></li> <li><a href="/wiki/Canadian_Society_of_Soil_Science" title="Canadian Society of Soil Science">Canadian Society of Soil Science</a></li> <li><a href="/wiki/Central_Soil_Salinity_Research_Institute" title="Central Soil Salinity Research Institute">Central Soil Salinity Research Institute</a> (India)</li> <li><a href="/wiki/German_Soil_Science_Society" title="German Soil Science Society">German Soil Science Society</a></li> <li><a href="/wiki/Indian_Institute_of_Soil_Science" title="Indian Institute of Soil Science">Indian Institute of Soil Science</a></li> <li><a href="/wiki/International_Union_of_Soil_Sciences" title="International Union of Soil Sciences">International Union of Soil Sciences</a></li> <li><a href="/wiki/International_Year_of_Soil" title="International Year of Soil">International Year of Soil</a></li> <li><a href="/wiki/National_Society_of_Consulting_Soil_Scientists" title="National Society of Consulting Soil Scientists">National Society of Consulting Soil Scientists</a> (US)</li> <li><a href="/wiki/OPAL_Soil_Centre" title="OPAL Soil Centre">OPAL Soil Centre</a> (UK)</li> <li><a href="/wiki/Soil_Science_Society_of_Poland" title="Soil Science Society of Poland">Soil Science Society of Poland</a></li> <li><a href="/wiki/Soil_and_Water_Conservation_Society" title="Soil and Water Conservation Society">Soil and Water Conservation Society</a> (US)</li> <li><a href="/wiki/Soil_Science_Society_of_America" title="Soil Science Society of America">Soil Science Society of America</a></li> <li><a href="/wiki/World_Congress_of_Soil_Science" title="World Congress of Soil Science">World Congress of Soil Science</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Scientific journals</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Acta_Agriculturae_Scandinavica_B" title="Acta Agriculturae Scandinavica B">Acta Agriculturae Scandinavica B</a></i></li> <li><i><a href="/wiki/Journal_of_Soil_and_Water_Conservation" title="Journal of Soil and Water Conservation">Journal of Soil and Water Conservation</a></i></li> <li><i><a href="/wiki/Plant_and_Soil" title="Plant and Soil">Plant and Soil</a></i></li> <li><i><a href="/wiki/Pochvovedenie" title="Pochvovedenie">Pochvovedenie</a></i></li> <li><i><a href="/wiki/Soil_Research" title="Soil Research">Soil Research</a></i></li> <li><i><a href="/wiki/Soil_Science_Society_of_America_Journal" title="Soil Science Society of America Journal">Soil Science Society of America Journal</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">See also</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Land_use" title="Land use">Land use</a></li> <li><a href="/wiki/Land_conversion" class="mw-redirect" title="Land conversion">Land conversion</a></li> <li><a href="/wiki/Land_management" title="Land management">Land management</a></li> <li><a href="/wiki/Vegetation" title="Vegetation">Vegetation</a></li> <li><a href="/wiki/Infiltration_(hydrology)" title="Infiltration (hydrology)">Infiltration (hydrology)</a></li> <li><a href="/wiki/Groundwater" title="Groundwater">Groundwater</a></li> <li><a href="/wiki/Crust_(geology)" title="Crust (geology)">Crust (geology)</a></li> <li><a href="/wiki/Impervious_surface" title="Impervious surface">Impervious surface</a>/<a href="/wiki/Surface_runoff" title="Surface runoff">Surface runoff</a></li> <li><a href="/wiki/Petrichor" title="Petrichor">Petrichor</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="3"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Project page"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/7/72/Symbol_project_class.svg/16px-Symbol_project_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/7/72/Symbol_project_class.svg/23px-Symbol_project_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/7/72/Symbol_project_class.svg/31px-Symbol_project_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Wikipedia:WikiProject_Soil" title="Wikipedia:WikiProject Soil">Wikipedia:WikiProject Soil</a></li> <li> <span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Soil" title="Category:Soil">Category soil</a></li> <li>  <a href="/wiki/Category:Soil_science" title="Category:Soil science">Category soil science</a></li> <li><span class="noviewer" typeof="mw:File"><span title="List-Class article"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/16px-Symbol_list_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/23px-Symbol_list_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/d/db/Symbol_list_class.svg/31px-Symbol_list_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/List_of_soil_scientists" title="List of soil scientists">List of soil scientists</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Plant_nutrition_/_Fertilizer" style="padding:3px"><table class="nowraplinks mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Plant_nutrition" title="Template:Plant nutrition"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Plant_nutrition" title="Template talk:Plant nutrition"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Plant_nutrition" title="Special:EditPage/Template:Plant nutrition"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Plant_nutrition_/_Fertilizer" style="font-size:114%;margin:0 4em"><a href="/wiki/Plant_nutrition" title="Plant nutrition">Plant nutrition</a> / <a href="/wiki/Fertilizer" title="Fertilizer">Fertilizer</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Physiological_plant_disorder" title="Physiological plant disorder">Imbalances</a></th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Boron_deficiency_(plant_disorder)" title="Boron deficiency (plant disorder)">Boron deficiency</a></li> <li><a href="/wiki/Calcium_deficiency_(plant_disorder)" title="Calcium deficiency (plant disorder)">Calcium deficiency</a></li> <li><a href="/wiki/Iron_deficiency_(plant_disorder)" title="Iron deficiency (plant disorder)">Iron deficiency</a></li> <li><a href="/wiki/Magnesium_deficiency#Plants" title="Magnesium deficiency">Magnesium deficiency#Plants</a></li> <li><a href="/wiki/Manganese_deficiency_(plant)" title="Manganese deficiency (plant)">Manganese deficiency</a></li> <li><a href="/wiki/Molybdenum_deficiency_(plant_disorder)" title="Molybdenum deficiency (plant disorder)">Molybdenum deficiency</a></li> <li><a href="/wiki/Nitrogen_deficiency" title="Nitrogen deficiency">Nitrogen deficiency</a></li> <li><a href="/wiki/Phosphorus_deficiency" title="Phosphorus deficiency">Phosphorus deficiency</a></li> <li><a href="/wiki/Potassium_deficiency_(plants)" title="Potassium deficiency (plants)">Potassium deficiency</a></li> <li><a href="/wiki/Zinc_deficiency_(plant_disorder)" title="Zinc deficiency (plant disorder)">Zinc deficiency</a></li> <li><a href="/wiki/Micronutrient_deficiency" title="Micronutrient deficiency">Micronutrient deficiency</a></li> <li><a href="/wiki/Chlorosis" title="Chlorosis">Chlorosis</a></li> <li><a href="/wiki/Fertilizer_burn" title="Fertilizer burn">Fertilizer burn</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Assimilation</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Nitrogen_assimilation" title="Nitrogen assimilation">Nitrogen assimilation</a></li> <li><a href="/wiki/Phosphate_solubilizing_bacteria" title="Phosphate solubilizing bacteria">Phosphorus assimilation</a></li> <li><a href="/wiki/Sulfur_assimilation" title="Sulfur assimilation">Sulfur assimilation</a></li> <li><a href="/wiki/Biofertilizer" title="Biofertilizer">Microbial assistance</a></li> <li><a href="/wiki/Photorespiration" title="Photorespiration">Photorespiration</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Methods</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Fertigation" title="Fertigation">Fertigation</a></li> <li><a href="/wiki/Fertilizer_tree" title="Fertilizer tree">Fertilizer tree</a></li> <li><a href="/wiki/Green_manure" title="Green manure">Green manure</a></li> <li><a href="/wiki/Hoagland_solution" title="Hoagland solution">Hoagland solution</a></li> <li><a href="/wiki/Hydroponic_dosers" title="Hydroponic dosers">Hydroponic dosers</a></li> <li><a href="/wiki/Living_mulch" title="Living mulch">Living mulch</a></li> <li><a href="/wiki/Nutrient_budgeting" title="Nutrient budgeting">Nutrient budgeting</a></li> <li><a href="/wiki/Nutrient_management" title="Nutrient management">Nutrient management</a></li> <li><a href="/wiki/Organic_fertilizer" title="Organic fertilizer">Organic fertilizer</a></li> <li><a href="/wiki/Plant_tissue_test" title="Plant tissue test">Plant tissue test</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Miscellaneous</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a class="mw-selflink selflink">Soil fertility</a></li> <li><a href="/wiki/Nutrient_pollution" title="Nutrient pollution">Nutrient pollution</a></li> <li><a href="/wiki/Soil_pH" title="Soil pH">Soil pH</a></li> <li><a href="/wiki/Agrobiology" title="Agrobiology">Agrobiology</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related concepts</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Algal_nutrient_solutions" class="mw-redirect" title="Algal nutrient solutions">Algal nutrient solutions</a></li> <li><a href="/wiki/Biostimulant" title="Biostimulant">Biostimulant</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="Natural_resources" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Natural_resources" title="Template:Natural resources"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Natural_resources" title="Template talk:Natural resources"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Natural_resources" title="Special:EditPage/Template:Natural resources"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Natural_resources" style="font-size:114%;margin:0 4em"><a href="/wiki/Natural_resource" title="Natural resource">Natural resources</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Atmosphere_of_Earth" title="Atmosphere of Earth">Air</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:7.0em;font-weight:normal;"><a href="/wiki/Air_pollution" title="Air pollution">Pollution / quality</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/National_Ambient_Air_Quality_Standards" title="National Ambient Air Quality Standards">Ambient standards <span style="font-size:85%;">(US)</span></a></li> <li><a href="/wiki/Air_quality_index" title="Air quality index">Index</a></li> <li><a href="/wiki/Indoor_air_quality" title="Indoor air quality">Indoor</a></li> <li><a href="/wiki/Air_quality_law" title="Air quality law">Law</a> <ul><li><a href="/wiki/Clean_Air_Act_(United_States)" title="Clean Air Act (United States)">Clean Air Act <span style="font-size:85%;">(US)</span></a></li></ul></li> <li><a href="/wiki/Ozone_depletion" title="Ozone depletion">Ozone depletion</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:7.0em;font-weight:normal;">Emissions</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Airshed" title="Airshed">Airshed</a></li> <li><a href="/wiki/Emissions_trading" title="Emissions trading">Trading</a></li> <li><a href="/wiki/Reducing_emissions_from_deforestation_and_forest_degradation" class="mw-redirect" title="Reducing emissions from deforestation and forest degradation">Deforestation (REDD)</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Energy" title="Energy">Energy</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bioenergy" title="Bioenergy">Bio</a></li> <li><a href="/wiki/Energy_law" title="Energy law">Law</a></li> <li><a href="/wiki/Energy_resources" class="mw-redirect" title="Energy resources">Resources</a></li> <li><a href="/wiki/Fossil_fuel" title="Fossil fuel">Fossil fuels</a> (<a href="/wiki/Fuel_gas" title="Fuel gas">gas</a>, <a href="/wiki/Peak_coal" title="Peak coal">peak coal</a>, <a href="/wiki/Peak_gas" title="Peak gas">peak gas</a>, <a href="/wiki/Peak_oil" title="Peak oil">peak oil</a>)</li> <li><a href="/wiki/Geothermal_energy" title="Geothermal energy">Geothermal</a></li> <li><a href="/wiki/Hydropower" title="Hydropower">Hydro</a></li> <li><a href="/wiki/Nuclear_power" title="Nuclear power">Nuclear</a></li> <li><a href="/wiki/Solar_energy" title="Solar energy">Solar</a> <ul><li><a href="/wiki/Sunlight" title="Sunlight">sunlight</a></li> <li><a href="/wiki/Shade_(shadow)" title="Shade (shadow)">shade</a></li></ul></li> <li><a href="/wiki/Wind_power" title="Wind power">Wind</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Land" title="Land">Land</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Agricultural_land" title="Agricultural land">Agricultural</a> <ul><li><a href="/wiki/Arable_land" title="Arable land">arable</a> <ul><li><a href="/wiki/Peak_farmland" title="Peak farmland">peak farmland</a></li></ul></li></ul></li> <li><a href="/wiki/Land_degradation" title="Land degradation">Degradation</a></li> <li><a href="/wiki/Field_(agriculture)" title="Field (agriculture)">Field</a></li> <li><a href="/wiki/Landscape" title="Landscape">Landscape</a> <ul><li><a href="/wiki/Cityscape" title="Cityscape">cityscape</a></li> <li><a href="/wiki/Seascape" title="Seascape">seascape</a></li> <li><a href="/wiki/Soundscape" title="Soundscape">soundscape</a></li> <li><a href="/wiki/Viewshed" title="Viewshed">viewshed</a></li></ul></li> <li><a href="/wiki/Land_law" title="Land law">Law</a> <ul><li><a href="/wiki/Property_law" title="Property law">property</a></li></ul></li> <li><a href="/wiki/Land_management" title="Land management">Management</a> <ul><li><a href="/wiki/Habitat_conservation" title="Habitat conservation">habitat conservation</a></li></ul></li> <li><a href="/wiki/Mineral" title="Mineral">Minerals</a> <ul><li><a href="/wiki/Gemstone" title="Gemstone">gemstone</a></li> <li><a href="/wiki/Industrial_mineral" title="Industrial mineral">industrial</a></li> <li><a href="/wiki/Ore" title="Ore">ore</a> <ul><li><a href="/wiki/Metal" title="Metal">metal</a></li></ul></li> <li><a href="/wiki/Mining" title="Mining">mining</a> <ul><li><a href="/wiki/Mining_law" title="Mining law">law</a></li> <li><a href="/wiki/Sand_mining" title="Sand mining">sand</a></li></ul></li> <li><a href="/wiki/Peak_minerals" title="Peak minerals">peak</a> <ul><li><a href="/wiki/Peak_copper" class="mw-redirect" title="Peak copper">copper</a></li> <li><a href="/wiki/Peak_phosphorus" class="mw-redirect" title="Peak phosphorus">phosphorus</a></li></ul></li> <li><a href="/wiki/Mineral_rights" title="Mineral rights">rights</a></li></ul></li> <li><a href="/wiki/Soil" title="Soil">Soil</a> <ul><li><a href="/wiki/Soil_conservation" title="Soil conservation">conservation</a></li> <li><a class="mw-selflink selflink">fertility</a></li> <li><a href="/wiki/Soil_health" title="Soil health">health</a></li> <li><a href="/wiki/Soil_resilience" title="Soil resilience">resilience</a></li></ul></li> <li><a href="/wiki/Land_use" title="Land use">Use</a> <ul><li><a href="/wiki/Land-use_planning" title="Land-use planning">planning</a></li> <li><a href="/wiki/Open_space_reserve" title="Open space reserve">reserve</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Life" title="Life">Life</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Biodiversity" title="Biodiversity">Biodiversity</a></li> <li><a href="/wiki/Bioprospecting" title="Bioprospecting">Bioprospecting</a> <ul><li><a href="/wiki/Biopiracy" title="Biopiracy">biopiracy</a></li></ul></li> <li><a href="/wiki/Biosphere" title="Biosphere">Biosphere</a></li> <li><a href="/wiki/Bushfood" class="mw-redirect" title="Bushfood">Bushfood</a></li> <li><a href="/wiki/Bushmeat" title="Bushmeat">Bushmeat</a></li> <li><a href="/wiki/Fishery" title="Fishery">Fisheries</a> <ul><li><a href="/wiki/Climate_change_and_fisheries" title="Climate change and fisheries">climate change</a></li> <li><a href="/wiki/Fisheries_law" title="Fisheries law">law</a></li> <li><a href="/wiki/Fisheries_management" title="Fisheries management">management</a></li></ul></li> <li><a href="/wiki/Forest" title="Forest">Forests</a> <ul><li><a href="/wiki/Forest_genetic_resources" title="Forest genetic resources">genetic resources</a></li> <li><a href="/wiki/Forestry_law" title="Forestry law">law</a></li> <li><a href="/wiki/Forest_management" title="Forest management">management</a></li> <li><a href="/wiki/Non-timber_forest_product" title="Non-timber forest product">non-timber products</a></li></ul></li> <li><a href="/wiki/Game_(food)" class="mw-redirect" title="Game (food)">Game</a> <ul><li><a href="/wiki/Game_law" title="Game law">law</a></li></ul></li> <li><a href="/wiki/Marine_conservation" title="Marine conservation">Marine conservation</a></li> <li><a href="/wiki/Meadow" title="Meadow">Meadow</a></li> <li><a href="/wiki/Pasture" title="Pasture">Pasture</a></li> <li><a href="/wiki/Plant" title="Plant">Plants</a> <ul><li><a href="/wiki/Plant_Treaty" class="mw-redirect" title="Plant Treaty">FAO Plant Treaty</a></li> <li><a href="/wiki/Food" title="Food">food</a></li> <li><a href="/wiki/Plant_genetic_resources" title="Plant genetic resources">genetic resources</a></li> <li><a href="/wiki/Gene_bank" title="Gene bank">gene banks</a></li> <li><a href="/wiki/List_of_plants_used_in_herbalism" title="List of plants used in herbalism">herbal medicines</a></li> <li><a href="/wiki/UPOV" class="mw-redirect" title="UPOV">UPOV Convention</a></li> <li><a href="/wiki/Wood" title="Wood">wood</a></li></ul></li> <li><a href="/wiki/Rangeland" title="Rangeland">Rangeland</a></li> <li><a href="/wiki/Seed_bank" title="Seed bank">Seed bank</a></li> <li><a href="/wiki/Wildlife" title="Wildlife">Wildlife</a> <ul><li><a href="/wiki/Wildlife_conservation" title="Wildlife conservation">conservation</a></li> <li><a href="/wiki/Wildlife_management" title="Wildlife management">management</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Water" title="Water">Water</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:7.0em;font-weight:normal;">Types / location</th><td class="navbox-list-with-group navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aquifer" title="Aquifer">Aquifer</a> <ul><li><a href="/wiki/Aquifer_storage_and_recovery" title="Aquifer storage and recovery">storage and recovery</a></li></ul></li> <li><a href="/wiki/Drinking_water" title="Drinking water">Drinking</a></li> <li><a href="/wiki/Fresh_water" title="Fresh water">Fresh</a></li> <li><a href="/wiki/Groundwater" title="Groundwater">Groundwater</a> <ul><li><a href="/wiki/Groundwater_pollution" title="Groundwater pollution">pollution</a></li> <li><a href="/wiki/Groundwater_recharge" title="Groundwater recharge">recharge</a></li> <li><a href="/wiki/Groundwater_remediation" title="Groundwater remediation">remediation</a></li></ul></li> <li><a href="/wiki/Hydrosphere" title="Hydrosphere">Hydrosphere</a></li> <li><a href="/wiki/Ice" title="Ice">Ice</a> <ul><li><a href="/wiki/Iceberg" title="Iceberg">bergs</a></li> <li><a href="/wiki/Glacier" title="Glacier">glacial</a></li> <li><a href="/wiki/Polar_ice_cap" title="Polar ice cap">polar</a></li></ul></li> <li><a href="/wiki/Irrigation" title="Irrigation">Irrigation</a> <ul><li><i><a href="/wiki/Huerta" title="Huerta">huerta</a></i></li></ul></li> <li><a href="/wiki/Marine_resources" title="Marine resources">Marine</a></li> <li><a href="/wiki/Rain" title="Rain">Rain</a> <ul><li><a href="/wiki/Rainwater_harvesting" title="Rainwater harvesting">harvesting</a></li></ul></li> <li><a href="/wiki/Stormwater" title="Stormwater">Stormwater</a></li> <li><a href="/wiki/Surface_water" title="Surface water">Surface water</a></li> <li><a href="/wiki/Sewage" title="Sewage">Sewage</a> <ul><li><a href="/wiki/Reclaimed_water" title="Reclaimed water">reclaimed water</a></li></ul></li> <li><a href="/wiki/Drainage_basin" title="Drainage basin">Watershed</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:7.0em;font-weight:normal;">Aspects</th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Desalination" title="Desalination">Desalination</a></li> <li><a href="/wiki/Flood" title="Flood">Floods</a></li> <li><a href="/wiki/Water_law" class="mw-redirect" title="Water law">Law</a></li> <li><a href="/wiki/Leaching_(agriculture)" title="Leaching (agriculture)">Leaching</a></li> <li><a href="/wiki/Sanitation" title="Sanitation">Sanitation</a> <ul><li><a href="/wiki/Improved_sanitation" title="Improved sanitation">improved</a></li></ul></li> <li><a href="/wiki/Water_scarcity" title="Water scarcity">Scarcity</a></li> <li><a href="/wiki/Water_security" title="Water security">Security</a></li> <li><a href="/wiki/Water_supply" title="Water supply">Supply</a></li> <li><a href="/wiki/Water_efficiency" title="Water efficiency">Efficiency</a></li> <li><a href="/wiki/Water_conflict" title="Water conflict">Conflict</a></li> <li><a href="/wiki/Water_conservation" title="Water conservation">Conservation</a></li> <li><a href="/wiki/Peak_water" title="Peak water">Peak water</a></li> <li><a href="/wiki/Water_pollution" title="Water pollution">Pollution</a></li> <li><a href="/wiki/Water_privatization" title="Water privatization">Privatization</a></li> <li><a href="/wiki/Water_quality" title="Water quality">Quality</a></li> <li><a href="/wiki/Water_right" title="Water right">Right</a></li> <li><a href="/wiki/Water_resources" title="Water resources">Resources</a> <ul><li><a href="/wiki/Improved_water_source" title="Improved water source">improved</a></li> <li><a href="/wiki/Water_resource_policy" title="Water resource policy">policy</a></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-even" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Commons" title="Commons">Commons</a> <ul><li><a href="/wiki/Enclosure" title="Enclosure">enclosure</a></li> <li><a href="/wiki/Global_commons" title="Global commons">global</a></li> <li><a href="/wiki/Common_land" title="Common land">land</a></li> <li><a href="/wiki/Tragedy_of_the_commons" title="Tragedy of the commons">tragedy of</a></li></ul></li> <li><a href="/wiki/Natural_resource_economics" title="Natural resource economics">Economics</a> <ul><li><a href="/wiki/Ecological_economics" title="Ecological economics">ecological</a></li> <li><a href="/wiki/Land_(economics)" title="Land (economics)">land</a></li></ul></li> <li><a href="/wiki/Ecosystem_services" class="mw-redirect" title="Ecosystem services">Ecosystem services</a></li> <li><a href="/wiki/Exploitation_of_natural_resources" title="Exploitation of natural resources">Exploitation</a> <ul><li><a href="/wiki/Overexploitation" title="Overexploitation">overexploitation</a></li> <li><a href="/wiki/Earth_Overshoot_Day" title="Earth Overshoot Day">Earth Overshoot Day</a></li></ul></li> <li><a href="/wiki/Natural_resource_management" title="Natural resource management">Management</a> <ul><li><a href="/wiki/Adaptive_management" title="Adaptive management">adaptive</a></li></ul></li> <li><a href="/wiki/Natural_capital" title="Natural capital">Natural capital</a> <ul><li><a href="/wiki/Natural_capital_accounting" title="Natural capital accounting">accounting</a></li> <li><a href="/wiki/Environmental_good" title="Environmental good">good</a></li></ul></li> <li><a href="/wiki/Natural_heritage" title="Natural heritage">Natural heritage</a></li> <li><a href="/wiki/Nature_reserve" title="Nature reserve">Nature reserve</a> <ul><li><a href="/wiki/Remnant_natural_area" title="Remnant natural area">remnant natural area</a></li></ul></li> <li><a href="/wiki/Systems_ecology" title="Systems ecology">Systems ecology</a></li> <li><a href="/wiki/Urban_ecology" title="Urban ecology">Urban ecology</a></li> <li><a href="/wiki/Wilderness" title="Wilderness">Wilderness</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:7.0em;font-weight:normal;"><a href="/wiki/Resource" title="Resource">Resource</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Common-pool_resource" title="Common-pool resource">Common-pool</a></li> <li><a href="/wiki/Conflict_resource" class="mw-redirect" title="Conflict resource">Conflict <span style="font-size:85%;">(perpetuation)</span></a></li> <li><a href="/wiki/Resource_curse" title="Resource curse">Curse</a></li> <li><a href="/wiki/Resource_depletion" title="Resource depletion">Depletion</a></li> <li><a href="/wiki/Resource_extraction" class="mw-redirect" title="Resource extraction">Extraction</a></li> <li><a href="/wiki/Resource_nationalism" title="Resource nationalism">Nationalism</a></li> <li><a href="/wiki/Renewable_resource" title="Renewable resource">Renewable</a> / <a href="/wiki/Non-renewable_resource" title="Non-renewable resource">Non-renewable</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:Natural_resources" title="Category:Natural resources">Category</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"><style data-mw-deduplicate="TemplateStyles:r1038841319">.mw-parser-output .tooltip-dotted{border-bottom:1px dotted;cursor:help}</style><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1038841319"></div><div role="navigation" class="navbox authority-control" aria-labelledby="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q202080#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><div id="Authority_control_databases_frameless&#124;text-top&#124;10px&#124;alt=Edit_this_at_Wikidata&#124;link=https&#58;//www.wikidata.org/wiki/Q202080#identifiers&#124;class=noprint&#124;Edit_this_at_Wikidata" style="font-size:114%;margin:0 4em"><a href="/wiki/Help:Authority_control" title="Help:Authority control">Authority control databases</a> <span class="mw-valign-text-top noprint" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q202080#identifiers" title="Edit this at Wikidata"><img alt="Edit this at Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">International</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="http://id.worldcat.org/fast/1124406/">FAST</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">National</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://d-nb.info/gnd/4007369-5">Germany</a></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="Soil fertility"><a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/sh85124344">United States</a></span></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://catalogue.bnf.fr/ark:/12148/cb11973651k">France</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://data.bnf.fr/ark:/12148/cb11973651k">BnF data</a></span></li><li><span class="uid"><span class="rt-commentedText tooltip tooltip-dotted" title="úrodnost půd"><a rel="nofollow" class="external text" href="https://aleph.nkp.cz/F/?func=find-c&local_base=aut&ccl_term=ica=ph153410&CON_LNG=ENG">Czech Republic</a></span></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="http://olduli.nli.org.il/F/?func=find-b&local_base=NLX10&find_code=UID&request=987007553398905171">Israel</a></span></li></ul></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"><ul><li><span class="uid"><a rel="nofollow" class="external text" href="https://www.idref.fr/027763668">IdRef</a></span></li><li><span class="uid"><a rel="nofollow" class="external text" href="https://catalog.archives.gov/id/10642306">NARA</a></span></li></ul></div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" 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