Effects of Different Cultivation Measures on Crude Protein Content and Yield of Silage Maize

In this article,effects of N fertilizer amount,P fertilizer amount and plant density to crude protein content and yield of different silage maize in different harvest periods were studied,applying 3 factors optimum saturation designing and regression equations.It showed the effects of P amount to crude protein content and yield increased,and the effects of N amount and density decreased with the postponing of growth stage.The effects of three factors are NDensityP in different harvest periods.In general,crude protein content and yield of maize showed single-peaked curve with the increasing of N and P amounts,showed Ucurve with the increasing of density.When harvest in pollen-scattering stage,grain-filling stage and milk stage,the crude protein yield increased with increasing of N and P amounts.The suitable N and P amounts were 270-350 kg/ha and 100-140 kg/ha to gain the higher crude protein yield in Hohhot.