选用3个不同类型大豆品种，在玉米大豆带状套作模式下研究了大豆种植密度对其田间主要农艺性状及籽粒产量的影响。结果表明，随种植密度增加，大豆株高、底荚高度趋于升高，有效分枝、单株荚数、单株粒数与单株粒重趋于下降，播种密度对荚粒数、百粒重无明显影响。套作大豆产量与种植密度呈二次抛物线变化趋势。在该套作模式下，晋豆19、中黄30、晋豆23的最佳种植密度分别为21.7万株/hm2、22.3万株/hm2、17.9万株/hm2。

The effect of different cultivars and densities on agronomic character and yield in corn-soybean intercropping system in Gaolan county， Lanzhou city， Gansu provience in Northwest irrigation districts. The result indicates that the yield of intercropped 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 optimum density of Jindou 19， Zhonghuang 30 and Jindou 23 are 217 thousand plants/hm2， 223 thousand plants/hm2 and 179 thousand plants/hm2， respectively.

S513；S565.1

兰州市农业科技专项(2015-3-37)；甘肃省农业科学院中青年基金(2015GAAS20) ；国家现代农业产业技术体系建设专项(CARS-04-CES17)；甘肃省农牧厅科技项目(GNKJ-2017-6)。