摘要： 通过三因素最优饱和设计，建立了氮肥、磷肥与种植密度三因素与不同收获时期青贮玉米粗蛋白质含量、产量的回归模型，各因素效应分析结果表明：随着收获期延迟，P对粗蛋白质含量的作用逐渐增强，氮和密度的作用逐渐减弱。不同收获期三因子对粗蛋白质产量的作用均表现为：N(X₁)>密度(X₃)>P(X₂)；总体来看，随氮、磷用量的增加，粗蛋白质的含量、产量均呈“单峰”曲线变化，随密度的增大则呈“U”型曲线变化。在散粉、灌浆、乳熟期3个不同时期收获，氮、磷对粗蛋白质均有显著的增产作用。呼和浩特地区青贮玉米生产中，获得较高粗蛋白质及产量的适宜施氮量为270～350 kg/hm²，施磷量为100～140 kg/hm²，此结果可作为呼和浩特地区青贮玉米生产的施肥标准。

关键词: 青贮玉米, 栽培措施, 粗蛋白质含量, 粗蛋白质产量

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

中图分类号: 

• S513