Effects of Irrigation Quantity and Irrigation Ways on Water Use Efficiency,Photosynthetic Characters and Yield of Winter Wheat

In order to provide experimental basis for the dicision-making of rational irrigation for different area and different winter wheat cultivars,a field experiment of random design including five different irrigation teratments and different irrigation ways is conducted with wheat cultivars linkang 2;water use efficiency(WUE),photosynthetic characteristics and yield characters of winter wheat are studied under different irrigation quantity and irrigation ways in this paper,The results showed that the soil moisture contents of the 0～60 cm soil layers were obviously affected by different irrigation ways,but the deep soil moisture contents were little affected.The yield is effected by irrigation through effects on 1000-grain weight;the water stress is disadvantage to increase 1000-grain weight after heading stage,the moderate water stress is disadvantage to increase yield but advantage to increase WUE at grain filling stage,WUE and yield are reduced by heavy water stress at grain filling stage.so the high yield and high WUE was obtained synchronously,thus the yield could not reduce on saving water of 600～1 500 m3/hm2 at Hexi areas of Gansu. Pn gradually declined with the growth period under different irrigation treatments,the changes of Tr and Gs varied at different irrigation treatments;Pn obviously decreasd following long-term water stress after heading stage,but Pn did not obviously declined after light and short-term water stress;Water stress isn't conducive to improving Gs and Tr after heading stage,but supplement irrigation can improve Gs and Tr after water stress.