节水灌溉条件下水稻生长季降雨利用率的试验研究

Study on Rainfall Utilization Rate of Rice under Different Water-saving Irrigation Modes

通过小区试验与桶栽试验,研究了寒地稻作区不同灌溉模式下的天然降水利用率。基于试验对比法,湿润灌溉下天然降水利用率最高(89%),淹灌、间歇灌溉次之(84%、77%),控制灌溉最低(72%)。基于水量平衡法计算的天然降水利用率,以湿润灌溉下最高,为95.79%;淹灌和间歇灌溉次之,分别为91.42%和87.22%;控制灌溉最低,为76.79%。

Barrel experiments and field experiments were conducted to study rainfall utilization rates of rice under different irrigation modes. The results showed that rainfall utilization of 89% under wet irrigation was the highest, the rainfall utilization rates under flood irrigation and intermittent irrigation came second with 84%, 77% respectively, and the rate of 72% under control irrigation was the smallest according to the comparative experiment method. Rainfall utilization rate of 95.79% under wet irrigation was the highest,the rates under flood irrigation and intermittent irrigation came second with 91.42% and 87.22% respectively,and the rate of 76.79% under control irrigation was the smallest based on water balance method.