1 控制树高当梨树中心干的高度和主枝数量达到整形要求时及时落头开心。对树势过旺或上强的树,可于前一年5月中下旬在中心干落头处进行环剥,待剥口以上枝大量结果,长势缓和后再进行落头,落头开心后,如果上部主枝仍然过高或直立,则应在适当部位回缩换头,并及时疏除背上 1 control tree height when the pear tree stem height and the number of main branches meet the requirements of plastic surgery timely drop head happy. On the trees over or strong on the tree, in the middle of the previous year in late May in the center of the first place to carry out girdling, to be more than a large number of results after exfoliation, to ease and then drop, head down , If the main branch is still too high or upright, it should be retracted in the appropriate parts of the head, and in time to sparse