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通过对轮、连作大豆干物质积累量的定期测定，发现连作大豆根、冠干物质积累量均低于轮作，根冠比（Ｒ／Ｓ，干重比）增大。这主要是由于连作大豆根系病虫害加重，磷、钾等元素亏缺，水分胁迫较重，内源生长素（ＩＡＡ）、赤霉素（ＧＡ３）、玉米素核苷（ＺＲｓ）、脱落酸（ＡＢＡ）的含量及比例变化导致冠部降低幅度大于根系，最终使根冠比增大
The results showed that the dry matter accumulation of root and shoot in continuous cropping was lower than that of crop rotation, and the root / shoot ratio (R / S, dry weight ratio) increased. This is mainly due to the aggravation of the pests and diseases of soybean continuous cropping, the deficiency of elements such as phosphorus and potassium, heavy water stress, the increase of IAA, GA3, ZRs, ABA ) Content and proportion changes led to the crown to reduce the rate of greater than the root, eventually increasing the ratio of root to shoot