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Vertisol
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{{short description|Clay-rich soil, prone to cracking}} {{Infobox soil |name=Vertisol |alternative_name= |image=Vertisol.jpg |image_size=250px |image_caption=A vertisol profile |classification_system=[[World Reference Base for Soil Resources|WRB]], [[USDA soil taxonomy]] |profile=OAC |parent_material= |code=VR |process=clay [[pedoturbation]] |climate=[[tropical savanna climate|tropical savanna]], [[semi-arid climate|semi-arid]], [[humid subtropical climate|humid subtropical]], [[Mediterranean climate|Mediterranean]] }} [[File:VertisolWorld.jpg|upright=1.6|thumb|Vertisols of the world]] [[File:Vertisol.gif|thumb|300px|A more detailed map of the global distribution of Vertisols]] A '''vertisol''' is a Soil Order in the [[USDA soil taxonomy]]<ref name=ST>{{Cite web|url = https://www.nrcs.usda.gov/sites/default/files/2022-09/Keys-to-Soil-Taxonomy.pdf|title = Keys to Soil Taxonomy 13th edition|author=Soil Survey Staff|year = 2022|publisher = USDA Natural Resources Conservation Service}}</ref> and a Reference Soil Group in the [[World Reference Base for Soil Resources]] (WRB).<ref name=WRB>{{Cite web|url = https://wrb.isric.org/files/WRB_fourth_edition_2022-12-18.pdf|title = World Reference Base for Soil Resources, fourth edition|author=IUSS Working Group WRB|year = 2022|publisher = International Union of Soil Sciences, Vienna}}</ref> It is also defined in many other soil classification systems. In the [[Australian Soil Classification]] it is called '''vertosol'''.<ref>{{Cite web|url = http://www.clw.csiro.au/aclep/asc_re_on_line/ve/vertsols.htm|title = Australian Soil Classification - Vertosols|access-date = 8 February 2016|publisher = CSIRO|archive-date = 7 March 2016|archive-url = https://web.archive.org/web/20160307085258/http://www.clw.csiro.au/aclep/asc_re_on_line/ve/vertsols.htm|url-status = dead}}</ref> The natural vegetation of vertisols is [[grassland]], [[savanna]], or grassy [[woodland]]. The heavy texture and unstable behaviour of the soil makes it difficult for many tree species to grow, and forest is uncommon.
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