由于果园管理粗放，树体结构不合理，骨干枝角度过小，造成树势上强下弱，内膛通风透光不良，小枝瘦弱，结果部位外移，产量低。为了改造这些低产苹果树，我们采取了以下技术措施。一、狠抓树下的土肥水管理每年秋季结合深翻扩穴，每株施有机肥２００公斤（１０年生以上）... Due to the extensive orchard management, the tree structure is unreasonable and the angle of the backbone branches is too small, resulting in strong weakness of the tree top, poor ventilation and ventilation in the bore, thin branchlets, and relocation of the result sites with low yield. In order to transform these low-yield apple trees, we have taken the following technical measures. First, pay close attention to the soil under the tree water and fertilizer management combined with the deep turning points every autumn, 200 kg per plant organic fertilizer (10 years of age or more) ...