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１．梨树干性比苹果树强，顶端优势明显，因此在幼龄期极易出现上强下弱现象。为防止这种现象的发生，梨树的下层主枝可留４～５个，可采用邻接着生、轮生、对生。而苹果树为防止“卡脖”，基部主枝要有明显的层内距，更不允许有轮生、对生枝出现。２除洋梨外，中国梨绝大多
1. Pear tree stronger than apple trees, the top advantage is obvious, so prone to weak in the young age. In order to prevent the occurrence of this phenomenon, the lower main branch of pear can stay 4 to 5, can be used next to students, students, students. The apple tree in order to prevent the “card neck”, the main branch of the base must have obvious layer spacing, but also not allowed to have a rotation, the emergence of raw branches. 2 In addition to pear, the vast majority of Chinese pear