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节水灌溉是节水型农业的重要措施之一，节水灌溉就是用最少的灌溉水量确保作物的正常生长，并尽可能提高作物产量。本文通过分析，建立了作物产量与耗水量的关系；建立了作物灌溉效益函数；并应用经济分析中净效益最大准则，导出了作物经济灌溉定额计算通式；利用系统工程理论提出了作物生育期内各次灌溉水最优灌水定额的求解方法。
Water-saving irrigation is one of the important measures for water-saving agriculture. Water-saving irrigation means ensuring the normal growth of crops with the minimum amount of irrigation water and maximizing the yield of crops. In this paper, the relationship between crop yield and water consumption has been established, the crop irrigation efficiency function has been established, and the general net benefit principle in economic analysis has been used to derive the formula of crop economic irrigation quota. The system of plant engineering has been used to propose crop growth period Solution method of optimum irrigation quota for each irrigation water.