IRRIGATION APPARATUS Russian patent published in 1997 - IPC

FIELD: agriculture, in particular, subsurface drop irrigation equipment. SUBSTANCE: apparatus has hermetically sealed tank 1, vacuum valve 2, air-releasing valve 3, water-discharge pipe 4, which are mounted on tank 1. Water-discharge pipe 4 is adapted to supply water through irrigation pipes 5 and perforations 6 made in irrigation pipe 5 to areas to be irrigated. As soil absorbs water, water level in tank is gradually reduced and, as a result, vacuum is created above water surface in tank 1. When vacuum extent reaches predetermined value, vacuum valve 2 is activated and new air portion is introduced into air cavity of tank 1 to resume water discharge process. EFFECT: increased efficiency, simplified construction and improved irrigation quality. 1 dwg