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研究了甘肃景泰灌区玉米灌浆期间籽粒增重和含水量的变化以及不同营养器官不同部位含水量的变化规律。结果表明，籽粒增重过程符合Ｌｏｇｉｓｔｉｃ曲线，籽粒含水量变化符合二次多项式；植株含水量变化随器官和部位的不同而异，其平均含水量变化也呈二次多项式。根据籽粒增重曲线方程、灌浆速度方程、植株含水量变化方程及其玉米秸秆青贮所需的适宜含水量进行综合分析，得出该地区玉米收籽、青贮临界收刈适期为吐丝后３７～４８ｄ。
The changes of grain weight gain and water content and the variation of water content in different parts of vegetative organs of corn in Jingtai Irrigation Area of Gansu Province were studied. The results showed that the grain weight gain accorded with Logistic curve, and the variation of grain water content was in accordance with the quadratic polynomial. The variation of plant water content varied with the organ and the part, and the average water content also showed quadratic polynomial. According to the equation of grain weight gain curve, the filling velocity equation, the change equation of plant water content and the appropriate moisture content of corn stalk silage, ~ 48d.