Effects of Different Water Treatments on Physiological Characteristics and Population Water Use Efficiency of Xun K8

In order to provide references for water management of wheat plantation in semi-arid areas,the effects of different water treatments on physiological characteristics and population water use efficiency were studied under condition of rainproof shelter with Xun K8 as experimental material.Three irrigation levels were set up in this study.The irrigation amount was 50%,100%and 150%of pan evaporation(EP 0.5,EP 1.0 and EP 1.5,respectively).The water control stages were jointing stage and filling stage.Results:Deficit irrigation(EP 0.5)at jointing and filling stages significantly decreased leaf area,relative water content,water loss rate in vitro and photosynthetic rate of Xun K8.Finally,the yield of EP 0.5 treatment was 42.53%lower than that of EP 1.0 treatment.Compared with EP 1.0 treatment,the water consumption and water use efficiency of EP 0.5 treatment were significantly reduced.Compared with EP 1.0 treatment,the leaf area of EP 1.5 treatment at jointing stage was significantly increased,but its the leaf area,relative water content and photosynthetic rate at grain filling stage were not significantly increased compared to EP 1.0.EP 1.5 treatment significantly increased water consumption,but its yield did not increase significantly when compared to that of EP 1.0 treatment.The water use efficiency of EP 1.5 treatment was significantly reduced by 9.17%compared with that of EP 1.0 treatment.In conclusion,increasing irrigation amount at jointing stage can improve the leaf area of Xun K8,while excessive irrigation at filling stage is not beneficial to the growth and physiological characteristics of Xun K8.Moreover,deficit irrigation or excessive irrigation at jointing and filling stages are not conducive to the improvement of water use efficiency.