苹果纺锤形中干偏弱的原因及对策答河北省沧县读者华潮清密植园采用纺锤形整形后，易发生中干偏弱现象，主要原因是在培养主枝时过多地起用了与中干延长枝势力相近的同龄强枝，在培养枝组时起用了与主枝势力相近的同龄强枝或中长枝，使中干、主枝、枝组三者之间粗细档次拉... Apple spindle-shaped stem weak reasons and solutions A reader Cangxian County, Hebei Province, China tidal dense plantation using spindle-shaped plastic, prone to dry weakness, mainly due to the excessive use of In the stem to extend the strength of branches of the same age strong branches, the use of branches and groups in the same branch with the main force of the same age strong branches or branches in the same age, so that the stem, the main branch, the group between the thickness of three grades. .