Effect of Nitrogen,Phosphorus,Kalium Coupling on Yield of Hybrid Cotton under Film Drip Irrigation

【Objective】Efffect of N,P and K coupling on growth and output of hybrid cotton under film drip irrigation.【Method】A field experiment was carried out to study output of cotton by 3414 complete test scheme of N,P and K,and set up a model equation of fertilizer and yield.【Result】The results showed that the effect of different proportion N,P and K application was significant on yield of cotton,the yield was decreased in the lower fertilizer quantity and the higher fertilizer quantity,the effect of N to cotton yield was more than P and K.Three-factor-two times equation of N,P and K was:Y=4 382.22+5.456 N+1.937 P+6.823 K+0.013 84 NP-0.009 24.N2-0.307 5 P2-0.027 72 K2,the best nitrogen,phosphorus and kalium fertilizer were 383.26,117.76,123.07 kg/hm2 by the model equations,the most yield was 5 961.8 kg/hm2.【Conclusion】 These results suggest that the right N,P and K nitrogen proportion would get high yield,and increase economic benefits.