| By analyzing the experiment data of spring wheat in 2002 to 2003, it is showed that the evpotranspiration in whole growing period of spring wheat in Xinjiang is ranged form 410 mm to 430 mm, both the amount and intensity of evapotranspiration is the highest during heading to milk ripening stage. About 38.3%42.0% of evapotranspiration is consumed by soil evaporation. There is a close relation between leaf area index and evpotranspiration intensity, which can be expressed by compound curve equation. The daily evapotranspiration of spring wheat field is simulated by using Penman-Monteith formula cooperated with crop coefficient and crop water stress index. The result indicates that this method is ideal in precision. |