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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）』
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