Effects of Nitrogen,Phosphorus,Potassium and Density on Yield of Raising Seedling and Transplanting Maize

In order to further discuss high yield cultivation techniques of maize,the effects of applications of nitrogen,phosphate,potassium and density on the yield were studied based on the universal rotary composition designing method of 4 factors and 5 levels,and the objective function to establish the mathematical model was set up.The results indicated that the differences of N、K、P applications and the density with the yield were significant.The effect order of all cultivation factors on yield was NdensityKP.According to the mode,the fertilizer plan which the yield surpassed 8 706.37 kg·hm-2 was 159.0～171.0 kg·hm-2 N,111.1～133.5 kg·hm-2 P2O5 and 72.3～94.6 kg·hm-2 K2O,the density ranged 6.8×105～7.3×105 plants·hm-2.