The Effect of Nitrogen,Phosphorus and Water Coupling on Spring Wheat Yield

【Objective】 The effect of water and fertilizer coupling on spring wheat yield was researched to provide scientific support for rational application of water and fertilizer on spring wheat in Xinjiang.【Method】 The experiments used three factorial and five level arrangement of treatments with 312-D optimized saturation design to conduct the test.The factors were nitrogen,phosphorus and water.【Result】The results were that nitrogen was the chief factor to affect spring wheat yield,phosphorus was the second factor and irrigation quantity was the third factor.Among which,nitrogen and phosphorus had positive effects on improving the spring wheat yield.As for the effective of two factors coupling,the effect order was water and phosphorus couplingnitrogen and phosphorus couplingwater and nitrogen coupling.Among which water and phosphorus coupling had a stimulation role in increasing wheat yield,whereas nitrogen and phosphorus coupling and water and nitrogen coupling had mutual replacement role in increasing wheat yield.【Conclusion】The optimized scheme of water and fertilizer application on spring wheat is obtained,which is when the amount of irrigation water was between 5 380.5-5 992.2 m3/hm2, nitrogen was 400.1-487.2 kg/hm2 and phosphorus was 195.6-249.2 kg/hm2,the spring wheat yield could reach 7 000-8 000 kg/hm2.