苹果纺锤形中干偏弱原因及对策密植苹果园采用纺锤形整形易发生中干偏弱现象，主要原因是培养主枝、枝组时，起用了与中干延长枝、主枝势力相近的同龄强枝，使中干、主枝、枝组之间主从不分。解决的办法：（１）主干延长枝要轻剪长放，疏除剪口下竞争枝，并对剪口下强旺枝... The reason and countermeasure of weak stem in apple spindle The countermeasure of weak stem axis in dense apple orchard is the main reason is that when cultivating main branch and branch group, Strong branches, so that dry, the main branch, Zhizuzhizhong never split. The solution: (1) trunk to extend the branch to light cut long, sparse cut under the competition branch, and cut under the strong Wang branch ...