Abstract:
Under the condition of control test,by using the quadratic general spinning design,the comprehensive effects of N、P fertilizers and water on winter wheat yield were studied.The results showed that the threshold value existed in waterfertilizer interaction. The threshold value of application amount of N and P
2O
5 are 90~240 kg/hm
2 and 56.25~221.25 kg/hm
2 respectively, and irrigation quota is 1500~3750m
3/hm
2.If the application amount of N,P
2O
5 and water is below the threshold value respectively, the effect of N and P
2O
5 on winter wheat will be unremarkable,and the water use efficiency will be low. Otherwise,the effect of waterfertilizer interaction will be remarkable.It is a significant way for improving the water use efficiency to increase application of N and P fertilizers and limit the water use quantity suitably. A mathematical model of winter wheat yield was established based on the results of experiment and simulation, the optimal scheme of waterfertilizer interaction under various objectives was worked out.