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本文分析了玉米、小麦生育期内光合速率的变化规律，论述了土壤水分亏缺对光合作用的影响，建立了水分亏缺对光合作用影响的定量评价指标，探讨了作物光合作用与水分散失的关系及作物水分利用效率的变化规律，据此论述了节水农业中的作物水分管理问题．
In this paper, the changes of photosynthetic rate in the growth of maize and wheat were analyzed. The effects of soil water deficit on photosynthesis were discussed. The quantitative evaluation index of the effects of water deficit on photosynthesis was established. The photosynthesis and water loss Relationship and crop water use efficiency of the law of change, based on the discussion of water-saving agriculture in crop moisture management issues.