又称腾发量、农田总蒸发量。作物蒸腾量与棵间土壤蒸发量的总和。在径流和渗漏量很小的情况下，农田蒸散量可大致代表农田实际的耗水量。
用它计算的水面最大可能蒸发量乘以一定系数，便可换算成农田蒸散量。
The amount of evapotranspiration of farm land can be calculated by multiplying the largest possible evaporation capacity of water surface with a special coefficient.
结果表明，辽宁省农田蒸散量年内呈单峰形变化，峰值出现在玉米抽雄开花期。
The Results showed that the annual change of the actual evapotranspiration was in single-peak type, the peak value occurred during booting flower stage of corn.
以田间实验资料为基础，建立农田蒸散量和土壤相对含水量与潜在蒸散的函数关系。
On the basis of the experimental data in farmland, a function relationship between the potential evapotranspiration and the relative water content of the soil in the root zone was established.
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