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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 Summer fallow ： ウィキペディア英語版 Summer fallow Summer fallow, sometimes called fallow cropland, is cropland that is purposely kept out of production during a regular growing season. Resting the ground in this manner allows one crop to be grown using the moisture and nutrients of more than one crop cycle. The summer fallow technique provides enough extra moisture and nutrients to allow the growth of crops which might otherwise not be possible and is closely associated with dryland farming. Usually this is done in semi-arid regions in order to conserve moisture for the next season. It also provides additional time for crop residues to break down and return nutrients to the soil for the subsequent crop, though this function has become less important since the widespread adoption of chemical fertilizers enabled farmers to artificially add vital nutrients. Fields which are fallow may be tilled or sprayed to control weeds and conserve moisture in the soil. The 1997 Census of Agriculture reported that , almost 5% of the of all cropland, was fallow that year. == References == * 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「Summer fallow」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.