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用数学模型定量化研究农田水分转化规律是农业节水机理研究的重要方面，但农田水分循环数学模型中的棵间土面蒸发和作物蒸腾过程难于计算。文中通过田间试验总结的土面蒸发和作物蒸腾计算模式，首先用Ｐｅｎｍａｎ公式计算出潜在腾发量，根据作物系数和作物覆盖度划分出作物颗间蒸发和作物蒸腾，再用试验资料总结的棵间蒸发与表土含水率经验关系计算实际棵间土面蒸发。该模式应用于数学模拟计算，其结果与田间实测资料对比，符合实际。文中蒸发蒸腾计算模式在农业节水机理研究中有实用价值。
The mathematical model of quantitative analysis of farmland water transfer is an important aspect of agricultural water saving mechanism. However, it is difficult to calculate soil surface evaporation and crop transpiration in the mathematical model of farmland water cycle. In this paper, the field evapotranspiration and crop transpiration calculation mode are summarized in this paper. First, the Penman formula is used to calculate the potential evapotranspiration. Crop evapotranspiration and crop transpiration are divided according to crop coefficient and crop coverage. Evaporation and topsoil moisture ratio between the empirical relationship between the calculation of the actual soil surface evaporation. The model is applied to mathematical simulation and the result is in good agreement with the field measured data. The model of evapotranspiration in this paper has practical value in the research of agricultural water saving mechanism.