栽培措施对青贮玉米粗脂肪含量及产量的影响

采用3因素最优饱和设计,系统地研究了氮肥、磷肥与种植密度3因素对不同收获时期青贮玉米粗脂肪含量及产量的影响。结果表明:N、P与密度是影响粗脂肪含量与产量的重要因子。随着收获期推迟,密度与N对粗脂肪含量的作用逐渐增强,P的作用逐渐减弱。对粗脂肪产量的作用因不同收获期而异。总的来说,随N、P用量的增加,青贮玉米整株粗脂肪的含量及产量均呈单峰曲线变化,随密度的增大则略呈下降趋势。获得较高粗脂肪产量(170～390kg/hm2)的适宜施N量为165～225kg/hm2,施P量为65～140kg/hm2。

Effect of Different Cultivation Measures on Crude Fat Content and Yield of Silage Maize

In this trial,effects of N fertilizer amount,P fertilizer amount and plant density to crude fat content and yield of different silage maize in different harvest periods were studied,applying 3 factors optimum saturation designing.It showed that N fertilizer amount,P fertilizer amount and plant density played important roles in crude fat content and yield of silage maize.The effects of N amount and density to crude fat content and yield increased,and the effect of P amount decreased with the postponing of growth stage.The effects of three factors are different because of different harvest periods.Crude fat content and yield of maize showed single-peaked curve with the increasing of N and P amounts,decreased with the increasing of density.The suitable N and P amount were 165-225 kg/ha and 65-140 kg/ha and the crude fat yield will reach 170-390 kg/ha.