Abstract
Evapotranspiration (ET) is an important component of the surface water cycle. In this study, we analyzed the differences between the estimated ET using the crop coefficients (kc) recommended by the Food and Agriculture Organization (FAO) and the measured ET with a lysimeter in Loess Plateau spring wheat (Triticum aestivum L.) from 2010 to 2012. Results showed that ET estimated from FAO-recommended crop coefficients (kc-FAO) was significantly overestimated (55%) compared with measured ET by lysimeter. Evapotranspiration was sensitive to the relative available water (Raw), and kc were strongly dependent on drought stress in semiarid area (p
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