采用单因素随机区组设计，研究了薯豆套作模式下大豆不同种植密度对作物产量的影响。结果表明，套作大豆产量与密度变化的关系可以用二次抛物线回归方程表达，并随大豆密度的增加，株高、主茎节数、底荚高度趋于升高，而有效分枝数、单株荚数、单株粒数和单株粒重趋于下降，荚粒数、百粒重变化不大，相对稳定。密度对套作马铃薯株高及单株结薯数影响不大，而商品薯率随密度增加而降低。大豆密度为15万株/hm2时，大豆、马铃薯产量均最高，分别是2 136.03、42 462.5 kg/ hm2。

In this study， single radom-plot design was conducted to study the effect of different densities on yield in early potato intercropping soybean in Gansu irrigation districts along Yellow River . The results indicated that the yield of relaying soybean changed with plant density， which could be expressed by using a parabola regression equation . With the increase of plant density， plant height， the number of the main stalk， the height of lowest pods increased， but the effective branching， pod number per plant， seed number per plant， grain weight per plant reduced， and seed number per pod， 100-grain weight almost kept stable . And the yield of relaying soybean and early potato was the highest with the optimum density of about 150 000 plants/hm2， which are 2 136.03 kg/hm2 and 42 462.5 kg/hm2， respectively .

S532；S682.2

现代农业产业技术体系-镇原大豆综合试验站项目(nycytx-004)部分内容