重迎茬是限制我省大豆单产提高障碍因素之一。本研究对重迎茬条件下，大豆根系生育、根瘤菌及产量构成因素进行了调查分析，为大豆种植的科学调控及减产控制提供科学依据，现将结果报告如下。１试验与方法试验于黑龙江省农科院试验地。设九个固定轮作小区，采取大区对比法... Replacing cropping is to limit one of the obstacles to improve soybean yield in our province. In this study, we investigated the root system growth, rhizobia and the yield components of soybean under the condition of replanting, and provided the scientific basis for the scientific regulation and yield control of soybean planting. The results are reported as follows. 1 test and method test Heilongjiang Academy of Agricultural Sciences test site. Set nine fixed rotation for the district, to take the area of ​​contrast method ...