Model simulation of optimal application rate of N,P and K fertilizers for “Xinsiyu 11” silage maize

By using Xinsiyu 11 as material,and adopting 3414 method with different ratios of N-P-K,the experiment was conducted in the experimental field of Xinjiang Academy of Agro-reclamation Sciences to investigate the effects of N,P and K fertilizers on silage maize,and to screen the optimal application ratio of N-P-K for high yield of silage maize in Xinjiang.The results showed that the content of available N was low,while the content of K2O and P2O5 was moderate in the tested soil.The yield of N2P2K2 was the highest(8066.79 kg·667m-2) among the 14 treatments.According to the analysis of quadratic regression,the fertilizer effect equation was Y=4659.93+79.56N-5.06N2+101.7P-33.81P2+286.4K-10.28K2+24.87NP+2.66NK-12.97PK.Through the optimization of the model,it was found that the optimum fertilization rate for Xinsiyu 11 was 21 kg N,5 kg P2O5 and 22 kg K2O for every 667 m2,under which the theoretical yield was 7692.96 kg·667m-2.