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highly erodible land : ウィキペディア英語版
highly erodible land
In United States agricultural policy, Highly erodible land (HEL) refers to land that is very susceptible to erosion, including fields that have at least 1/3 or of soils with a natural erosion potential of at least 8 times their T value.〔(【引用サイトリンク】url=http://law.justia.com/cfr/title07/7-1.1.1.1.14.2.html )〕 About of cropland meet this definition of HEL, according to the 1997 National Resources Inventory.〔(【引用サイトリンク】url=http://www.nrcs.usda.gov/feature/outlook/Soil%20Erosion.pdf )〕 Farms cropping highly erodible land and under production flexibility contracts must be in compliance with a conservation plan that protects this cropland.〔(【引用サイトリンク】url=http://www.ers.usda.gov/briefing/farmpolicy/glossary.htm#conscompliance )


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