一、脱落原因1.通风透光不良。一是光照条件差,光合产物减少,花荚得不到充足养分而大量脱落。二是群体结构对通风透光条件有直接影响。密度过大或栽培技术不良,易引起徒长,过早封垄,枝叶郁蔽,致使下部叶片叶绿素含量降低,逐渐黄化,营养物质积累减少,造成花荚脱落。 First, the reasons for shedding 1. Poor ventilation and light. First, poor lighting conditions, reduced photosynthetic products, flower pods not enough nutrients and a large number of off. Second, the group structure has a direct impact on ventilation and light conditions. Density is too large or poor cultivation techniques, easy to cause leggy, premature closure ridge, branches and leaves stagnant, resulting in lower chlorophyll content of leaves lower, gradually yellow, reduce the accumulation of nutrients, resulting in loss of flower pods.