Estimation of evapotranspiration and crop coefficients of winter wheat and summer maize in Yangling Zone

In order to find crop water requirement and crop coefficients of winter wheat and summer maize in Yangling, Shaanxi, the authors analyzed and calculated evapotranspiration of winter wheat and summer maize with measured evapotranspiration using dual crop coefficient approaches recommended by FAO based on experimental data. The crop basal coefficients of wheat and maize are estimated.