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依据在渭北黄土高原区的大田玉米调亏灌溉试验资料，分析了不同亏水处理对光合速率、气孔导度，蒸腾速率、根冠比、产量与耗水量以及水分利用效率等因素的影响，从亏水处理引起的气孔反应能提高光合与蒸腾之比，揭示了调亏灌溉的节水增产机理。最后，从既提高产量又提高水分利用效率的双重目的出发，得到了苗期土壤含水率为５０％～６０％田间持水量、拔节期土壤含水率为６０％～７０％田间持水量是最佳的调亏灌溉方案。
According to the regulated deficit irrigation data of field corn in Weibei Loess Plateau, the effects of different deficit treatments on photosynthetic rate, stomatal conductance, transpiration rate, ratio of root to shoot, yield and water consumption and water use efficiency were analyzed. Stomatal reaction caused by water deficit treatment can increase the ratio of photosynthesis to transpiration, revealing the water-saving and yield-increasing mechanism of regulated deficit irrigation. Finally, from the dual purposes of both increasing yield and improving water use efficiency, the field water holding capacity of 50% -60% at seedling stage was obtained, and the field water holding capacity at jointing stage was 60% -70% Regulated deficit irrigation program.