Effect of irrigation on water consumption composition and use efficiency of winter wheat

Quantitative analysis was made of the situation of soil water use,water consumption composition during its growth seasons and key stages as well as water use efficiency(WUE) under different irrigation levels in different rainfall years.Taking Beijing as the typical region,five different irrigation treatments were designed(non-irrigation,irrigation 50 mm,irrigation 100 mm,irrigation 150 mm and irrigation 200 mm) according to the growth periods of winter wheat,water consumption was determined with neutron probe and water balance method. Then water consumption character of winter wheat in its growth seasons and key ages was analyzed.The results showed that water consumption of winter wheat became larger while increasing irrigation,the largest stage was the jointing and heading stage,and the seeding stage was the least.Soil water consumption reduced when increasing irrigation.Rainfall,irrigation and soil water supply were the chief sources of winter wheat water consumption,the rate of rainfall and soil water supply was larger in less rainfall year,but rainfall was its main source in rainy year.Water from irrigation became the chief part while increasing irrigation.The yield of winter wheat increased,but water use efficiency(WUE) and irrigation water use efficiency(WUEi) reduced while irrigation increasing.The results show that there are differences in water consumption composition and use efficiency of winter wheat during its growth seasons and key stages under different irrigation levels.