Effects of Nitrogen,Phosphorus and Potassium on Rice

[Objective]The research aimed to optimize fertilization technique of rice in Taining County.[Method]The effects of N,P and K on rice were studied through3414fertilizer trial.[Result]The effects of nitrogen,phosphorus and potassium on the yield revealed the following order:nitrogen potassium phosphorus.The quadratic polynomial regressive models of fertilization effects were simulated.According to the constructed models,the theoretical nitrogen application rate for gaining maximum yield(8 949.0 kg/hm2) was 216.0 kg/hm2,and the ratio of nitrogen,phosphorus and potassium was 1.00 ∶ 0.42 ∶ 0.56.The theoretical nitrogen application rate for gaining optimal economical yield(8 913.0 kg/hm2) was 198.0 kg/hm2,and the ratio of nitrogen,phosphorus and potassium was 1.00∶ 0.45∶ 0.48.[Conclusion]The research could provide the guidance for economic fertilization of purple rice production in the local area.