一、与修剪有关的生物学特性(一)长把梨极性很强,易出现上强下弱。修剪不当,往往影响幼树第一层主枝的培养和发展,造成大树内膛与下层枝组大量死亡。(二)长把梨具有长、中、短三类果枝,和一部分腋花芽。短果枝是主要果枝类型,停长早,成花易,花芽饱满,结实能力强。中、长果枝的结实能力也较强,但腋花芽结实能力 First, the biological characteristics of pruning (A) Pear very long, prone to weak on the strong. Improper pruning often affects the cultivation and development of the first branch of the young tree, resulting in a large number of deaths in the tree bore and lower branch. (B) of the long pears with long, medium and short three kinds of branches, and part of axillary buds. Short fruit branch is the main fruit branch type, long stop early, easy to flower, full flower buds, strong ability. In the fruit, fruiting branches also strong ability, but axillary buds strong ability