密度和施氮量对糜子产量及综合性状的影响

为了提高寒地半干旱地区糜子产量，采用裂区设计，密度为主区，设4个水平，45万株/hm2，52.5万株/hm2，60万株/hm2，67.5万株/hm2；施氮量（纯氮）为亚区，设5个水平，0、45 kg/hm2、60 kg/hm2、135 kg/hm2、180 kg/hm2，共20个处理，对糜子不同种植密度和施氮量对产量性状影响的研究，比较产量差异及叶绿素、叶面积、土壤碱基氮的变化特征。结果表明：密度在60万株/hm2，施氮量在60 kg/hm2策略下，既能获得较高产量又能获得较高的经济效益。为了获得较高的产量，在低密度条件下，应适当增加施氮量，增加养分，促进分蘖，随着密度的增加，应适当减少施氮量，控制分蘖，使糜子收获时的密度达到或接近62万株/hm2~69万株/hm2这一范围内最适密度。

Effect of Planting Density and Nitrogen Fertilizer Topdressing on Yield Character of Broomcorn Millet

By Millet different density and nitrogen on yield traits to recover research on the impact, for millet cultivation techniques to provide a theoretical basis. Using split-plot design, density-based area, located four levels for the sub-region to recover nitrogen, 45 million/hm2, 52.5 million/hm2, 60 million/hm2, 67.5 million/hm2; located 5 level, 0 kg/hm2, 45 kg/hm2, 60 kg/hm2, 135 kg/hm2, 180 kg/hm2, a total of 20 treatments, compare yield differences and chlorophyll, leaf area, soil nitrogen base variation. The results showed that, density of 60 million/hm2, chasing nitrogen in 60 kg/hm2 strategy, access to both a higher yield but also a higher economic efficiency. In order to obtain a higher yield, in the low-density conditions, should be increased to recover nitrogen, increased nutrients, and promote tillering. In the high-density conditions, the nitrogen should be reduced to recover the control tiller, so that the density of millet harvest reached densities at or close to 62 million/hm2-69 million/hm2 optimum density within the range.