Effects of Different N,P and K Amount and Combination on Agronomic Characters and Yield of Zhongyou 85,a Hybrid Rice Variety

The optimum fertilization mathematical model for Zhongyou 85,a hybrid rice variety,was established by carrying out the experiment of different N,P and K amount and combinations in Shiqian county.The yield of 582.1kg/667m2 could be obtained under the fertilization condition of N 9.48 kg/667m2,P2O5 4.21 kg/667m2and K2O 9.7kg/667m2.