Study on 3414 Fertilizer Effect of Cotton at Different Fertility Level in Xinxiang—Optimized Fertilizer Rate of Nitrogen,Phosphorus and Potassium

The data from 3414 fertilizer effect experiment of cotton about nitrogen,phosphorus and potassium were used to establish the regression model for the high-yield field in Weizhuang Village,Huojia,medium-high-yield field in Dongtun Village,Yanjin,and low-yield field in Hutouzhuang Village,Weihui,respectively.Through the frequency analysis method by simulating factors,the optimum fertilizer rate of N,P2O5 and K2O for high-yield field was 380.3-394.94 kg/hm2,192.81-200.23 kg/hm2 and 297.80-311.4 kg/hm2,respectively,and the seed cotton yield could reach 4 456.07-4 483.42 kg/hm2.The optimum fertilizer rate of N,P2O5 and K2O for medium-high yield field was 94.08-112.54 kg/hm2,48.85-59.0 kg/hm2 and 263.34-277.96 kg/hm2,respectively,and the seed cotton yield could reach 3 906.63-3 962.18 kg/hm2.The optimum fertilizer rate of N,P2O5 and K2O for medium-low yield was 43.76-271.59 kg/hm2,210.48-214.00 kg/hm2 and 286.73-301.02 kg/hm2,respectively,and the seed cotton yield was 3 317.41-3 352.80 kg/hm2.The interaction effect of two factors and the single factor effect in each modal were also analyzed.