On Effect of Balanced Fertilization on Rice Yield and its Components at Longxi River Basin

The 3414 optimal design of quadratic regression program was used in this experiment to study the balanced fertilization model of rice,which holds the largest planting area of crop at Longxi river basin.The effects of nitrogen,phosphorus and potassium on yield of rice were investigated and the fertilizer response functions were built to explore a set of high-yield balanced fertilization model,so as to provide guidance for the fertilization management in the production of rice.The results showed that among the 14 treatments,the highest rice yield appeared in treatment 7(N 210 kg/hm2,P2O5 315 kg/hm2,K2O 150 kg/hm2).Among the components of yield,1 000-grain weight,grain number per panicle and effective panicle were the primary ones affected by N,P,K,respectively.N,P,K combination could increase the rice yield and the primary influencing factors affecting the rice yield was nitrogen,followed by potassium and phosphorus.In order to obtain rice yield of more than 5 500 kg/hm2,the suitable fertilization program was as follows:pure nitrogenous of 238.25～286.75 kg/hm2,pure phosphorus of 100.91～214.09 kg/hm2 and pure potassium of 41.13～92.20 kg/hm2.