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对油８９３０６组合分离世代的研究表明，该组合存在３种叶形垂直分布类型，即下阔叶—上阔叶、下阔叶—上窄叶和下窄叶—上窄叶。以下阔叶—上阔叶和下阔叶—上窄叶类型的百粒重最大，且两类型间无明显差异，但显著高于下窄叶—上窄叶类型的百粒重；以下窄叶—上窄叶类型的每荚粒数最多，下阔叶—上阔叶类型的每荚粒数最少。在本研究所处旱涝频繁的黄淮南部地区，以下阔叶—上窄叶类型的育种效果最好，并从本类型的研究材料中成功地选育出高产夏大豆新品种中豆２６。与下阔叶—上阔叶类型的中豆１９（８９３０６组合的母本）相比，下阔叶—上窄叶的材料中豆２６和中豆２０实现了在保持其它产量因素变化很小前提下每荚粒数的定向显著提高，因而实现产量的改良。
Studies on the segregation generation of oil 89306 showed that there are three types of leaf-shaped vertical distributions in the combination, ie, lower broad-leaved upper leaves, lower broad-leaved upper leaves and lower-narrow leaves-upper narrow leaves. The following broadleaved - upper broadleaf and lower broadleave - upper narrowleaved types had the highest percentage of hundred kernels, with no significant difference between the two types, but significantly higher than those of the lower narrowleaf - upper narrowleaf type; - Larger narrow leaf types have the highest number of pods per pod, and lower broad - upper hardwood types have the fewest pods per pod. In the southern part of Huanghuai where Droughts and floods are frequent in this study, the following broadleaved-upper and narrow-leaf type breeding effect is the best, and Zhongnong26, a new high-yielding summer soybean variety, was successfully bred from this type of research material. The lower broad-upper narrow leaf material Zhong Dou 26 and Zhong Dou 20 achieved a small change in other yield factors while maintaining the lower broad-leaved upper middle bean 19 (89306 combined female parent) Under each pod number orientation significantly increased, thus achieving improved yield.