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研究大豆根系的动态变化有助于探讨大豆根系对土壤环境影响的各个时期和各土层的机制。结果表明：大豆分枝期至开花期根系生长迅速，各处理此时期皆占苗期至鼓粒期总根量的 ６０～７０％。 Ａ、Ａ＇和 Ｂ三处理最大根量在结荚期，只有 Ｂ＇最大根量提前。在结荚期、Ａ处理根重及根长比Ｂ＇分别增长４１％和９１％。大豆结荚期根系在土壤层中的分布： ０～ １０ｃｍ根重比其它层次占绝对优势，其中 Ａ＇较明显。大豆根长在１０～２０ｃｍ土层占优势，但与其他层次的差别小于根重的差别。大豆根重与大豆产量呈正相关，凡使大豆增产的技术都增加其根重。
Studying the dynamic changes of soybean root system will help to explore the mechanism of soybean root system on soil environment in different periods and in different soil layers. The results showed that the root system grew rapidly from the branching stage to the flowering stage, accounting for 60% -70% of the total seedling stage. A, A ’and B three processing the largest root in the podding stage, only the B’ maximum root advance. At the podding stage, root weight and root length of A increased by 41% and 91%, respectively, than that of B ’. The distribution of roots in soybean podding stage in soil layer: the root weight of 0 ~ 10cm accounted for the absolute superiority than the other layers, among which A ’was more obvious. Soybean root length in 10 ~ 20cm soil layer dominant, but with other levels of difference is less than the difference of root weight. Soybean root weight and soybean yield was positively correlated, any increase in soybean technology have increased its root weight.