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为明确内蒙古2 500℃以上有效积温区不同播期适宜种植的大豆品种及种植密度,本文以MG000、MG00、MG0、MGⅠ生育期组大豆品种为试验材料,开展不同播期、密度试验,通过产量特征分析,确定各生育期组品种的适宜播种期及种植密度。结果表明:MG000组品种适宜作救灾播种品种,适宜生育日数为85~90 d,最佳种植密度在24万~30万株·hm~(-2),叶面积指数范围为2.0~2.2;MG00和MG0组品种适宜晚播,适宜生育日数为90~100 d,最佳种植密度24万~30万株·hm~(-2),叶面积指数范围分别为2.3~2.7、2.8~3.1;MGⅠ组品种种植应适时晚播,适宜生育日数为100~110 d,最佳种植密度21万~24万株·hm~(-2),叶面积指数范围为3.0~3.3。
In order to clarify the soybean varieties and planting densities suitable for sowing in different effective sowing areas above 2 500 ℃ in Inner Mongolia, the soybean varieties of MG000, MG00, MG0 and MGⅠ in the growing period were used as tested materials to carry out different sowing dates and density tests. Characteristic analysis to determine the appropriate sowing date and planting density of the varieties of each growth period. The results showed that the varieties of MG000 were suitable for disaster-relief sowing date. The suitable breeding days ranged from 85 days to 90 days. The optimal planting density ranged from 240,000 to 300,000 plant-hm -2 and the leaf area index ranged from 2.0 to 2.2. MG00 And MG0 were suitable for late sowing. The suitable breeding days was 90 ~ 100 days, the best planting density was 240,000 ~ 300,000 plants · hm -2, leaf area index range was 2.3 ~ 2.7 and 2.8 ~ 3.1 respectively. MGⅠ Planting varieties should be late sowing timely, suitable breeding days for 100 ~ 110 d, the best planting density of 210,000 to 240,000 plants · hm -2, leaf area index range of 3.0 to 3.3.