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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 Center pivot irrigation ： ウィキペディア英語版 Center pivot irrigation Center-pivot irrigation (sometimes called central pivot irrigation), also called waterwheel and circle irrigation, is a method of crop irrigation in which equipment rotates around a pivot and crops are watered with sprinklers.〔(ddr.nal.usda.gov ) Center pivot irrigation system modification to provide variable water application depths.〕 A circular area centered on the pivot is irrigated, often creating a circular pattern in crops when viewed from above (sometimes referred to as ''crop circles''). Most center pivots were initially water-powered, and today most are propelled by electric motors. ==History== Center-pivot irrigation was invented in 1940 by farmer Frank Zybach, who lived in Strasburg, Colorado.〔 It was recognized as a method to improve water distribution to fields.〔 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「Center pivot irrigation」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.