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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Soil loss tolerance ： ウィキペディア英語版 Soil loss tolerance Soil loss tolerance for a specific soil, also known as the T value, is the maximum average annual soil loss expressed as tons per acre per year that will permit current production levels to be maintained economically and indefinitely. T values range from 2 to 5 tons per acre per year. According to the United States Department of Agriculture's National Resource Conservation Service, in 2007 in the US, 99 million acres (28% of all cropland) were eroding above soil loss tolerance (T) rates. This was compared to 169 million acres (40% of cropland) in 1982. == References == *(【引用サイトリンク】 title=Report for Congress: Agriculture: A Glossary of Terms, Programs, and Laws, 2005 Edition ) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Soil loss tolerance」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.