Abstract: 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 N>Density>P 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.

Key words: Silage maize, Cultivation measures, Crude protein content, Crude protein yield

CLC Number: 

• S513