The ratio between soil evaporation and crop evapotranspiration in each month and in the whole growing period of winter wheat are obtained from observed evolution of soil evaporation rate in the field.

• 在农田水量平衡的各种计算模型中，总是用参照腾发量与作物系数的乘积计算作物总腾发量，而如何将土面蒸发与叶面蒸腾分开，一直是困扰着人们的难题。