Center pivot irrigation system having a pressure sensitive drive apparatus

摘要: A center pivot irrigation system includes an line supported by towers and rotatable about a central pivot. One tower thereof, for example the outermost tower, drive motor energized in response to signal from pressure responsive control apparatus. The apparatus is operable sense magnitude of water at selected location therefore decreases such when travels uphill increases downhill. produces sensed which causes move rate inversely related average relative elevation line. That is, faster rates travel below reference lower above thereby prevent underwatering slopes overwatering downhill slopes. preferably equal area that traversed portion its end. Thus, representative location.