The crop coefficients(K_c)are 0.30, 0.40, 0.90 and 0.88 in NGP, IGP, MGP and EGP, respectively. The actual evapotranspiration is determined to be 962.0 mm in a whole year and 2.63 mmd~-1 of a daily mean.

• 确定了牧草非生长期、生长初期、生长中期、生长末期的Kc分别为0.；30、0