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我国南方梨树多为砂梨系统(包括日本梨)品种。在高温、多湿、生长期长的物候条件下,肥水充足时,梨树生长量大:1～5年生幼树的新梢长度多数为70～120厘米,粗度直径为1.0～1.4厘米;部分中干、主枝延长枝的新梢长达150～200厘米,粗度直径为1.4～2.1厘米。这样的生长量,如果采用不正确的修剪方法,很容易造成上强下弱的现象,产生树体高,冠幅小,高冠比值大于1.5～2.0,丰产性能差等不良的树体结构。
Pear trees in southern China are mostly pear system (including Japanese pear) varieties. Under the conditions of high temperature, humidity and long growing period, when the fertilizer and water are sufficient, the growth of pear tree is large: the shoot length of young trees of 1 to 5 years old is mostly 70 to 120 cm and the diameter of coarseness is 1.0 to 1.4 cm; In the dry, the main branch to extend the branches of the new shoot up to 150 to 200 cm, diameter of 1.4 to 2.1 cm in diameter. If such an amount of growth is improperly pruned, it is easy to cause the phenomenon of weakness on the top and the weakness resulting in a tree structure with a high tree height, a small crown width, a high crown ratio of more than 1.5 to 2.0, and poor high yield performance.