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5节水高产灌溉制度分析5．1灌溉定额作物灌溉定额取决于作物需水量和需水规律以及作物生育期内的降水量，在地下水埋藏较深，不计地下水补给量和旱作物灌溉时不允许发生深层渗漏，作物生育期灌溉定额可表示为：式中M——生育期内灌溉定额；ET——全生育期需水量；P0——生育期
5 Water-saving and high-yielding irrigation system analysis 5.1 Irrigation quota Irrigation quotas depend on the crop water demand and water demand and crop growth during the precipitation, deep buried in groundwater, regardless of groundwater recharge and irrigated crops Allow deep leakage occurs, crop growth period irrigation quota can be expressed as: where M - irrigating period of growth period; ET - water demand throughout the growth period; P0 - growth period