Study on mathematical models of fertilizer management technique for resisting lodging and high yield of super hybrid rice

In order to probe into the fertilizer management technique for high lodging resistance and high yield of super hybrid rice, and improve its ability to resist lodging and yield stability, the effects of various application ratios of nitrogen, potassium and silicon on lodging resistance and yield of super hybrid rice, Zhunliangyou527 were studied in fields with the orthogonal rotational design. The mathematical models between fertilizer application amount and lodging index, yield were established. The results show that the silicon application has the most influence on lodging index, and then the nitrogen and potassium applications. The additional silicon and potassium fertilizer applications not only increase the yield but also advance the ability to resist lodging. The nitrogen application has the most influence on yield, and then the silicon and potassium applications. The nitrogen application could increase yield and lodging index when the application rates are in the range of N 0 to 267 kg/ha. The fertilizer application amounts for strong ability to resist lodging and high yield are N 286.5298.5 kg/ha, K2O 295.598.5 kg/hm2 and SiO2 292.598.5 kg/ha under the conditions that the lodging index is less than 150 and the yield is more than 11 ton per hectare