我市现在苹果结果树200万株左右,其中有10%左右的结果树大枝过多,树冠郁闭,风光条件恶化,这部分树为10年生以上的低产旺树和20年生左右高产变低产树,树体健壮,增产潜力大,如何改善管理增加产量,是急待解决的问题。根据低产原因调查,在加强土肥水管理的基础上,突出问题是调整树 Nowadays, there are about 2 million apple trees in our city, of which about 10% have too many large tree branches, canopy crowns and deteriorating scenery conditions. This part of trees are low-yielding flourishing trees over 10 years old and low yielding trees around 20 years old , Robust tree, increasing yield potential, how to improve management to increase production, is an urgent problem to be solved. According to the survey of low yield causes, on the basis of strengthening the management of soil and fertilizer, the outstanding problem is that the adjustment tree