种植密度对辽宁省主栽大豆品种主要性状及产量的影响

Effects of Planting Density on Major Characteristics and Yield of Mainly Cultivated Soybean Varieties in Liaoning Province

选用当前辽宁省主栽的两种不同结荚习性的4个大豆品种，对不同种植密度处理两种结荚类型大豆品种的农艺性状、产量构成性状、群体产量和品质进行分析比较。结果表明：有限结荚类型品种辽豆15号和铁丰29号适宜种植密度在12万-15万株／hm^2；亚有限结荚类型品种辽豆21号和铁丰31号适宜种植密度在18万株／hm^2左右。随种植密度增加，品种的株高、籽粒蛋白质含量呈现递增趋势，而有效分枝数、单株粒重和百粒重等性状及籽粒脂肪含量呈现递减趋势；种植密度对不同结荚类型大豆品种的主茎节数、百粒重和群体产量影响存在较大差异。

Four soybean varieties from two different growth habits types which are mainly cultivated now time in Liaoning province Were used in this testing, comparison and analyses of agronomic characteristics and yield and quality of four varieties are base on different planting densities. The result indicated that density from 0. 12 to 0.15 million plants per hectare is more suitable for Liaodou 15 and Tiefeng 29 which are belong to determinate type, planting density about 0.18 million plants per hectare is suitable for Liaodou 21 and Tiefeng 31 which are belong to semi-determinate type. With the increase of planting density ,plant height and fat content was increased,while branch number and grain weight per plant and 100-seeds weight and protein content were decreased. Significant difference was showed that different planting densities effected on nod number and 100- seeds weight and yield per hectare between two growth habit types.