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果树徒长乃是果树栽培上的一大忌讳。良好的栽培技术,应有效地控制果树徒长,使树势过强的果树成为有树力的果树,同化产物能用于果实生产或贮存起来,保证果树植物相对地处于生长与结果动态平衡的最佳状态。上海地处落叶果树与常绿果树的混生带,生态条件对落叶果树来说,积温偏高,降水量偏大,尤其是年生长前期,正值落叶果树贮藏养分的消耗期,根、枝、叶的伸展和开花均依赖上年的贮藏养分。多雨少光,更易导致枝叶的旺盛生长,加速同化物质的消耗,在较长时间内大于新叶的制造。果实发
Fruit tree is a fruit tree cultivation is a major taboo. Good cultivation techniques should effectively control the growth of fruit trees so that the fruit trees with overgrowth become trees with fruit trees and the assimilation products can be used to produce or store fruits and ensure the fruit trees are relatively in the dynamic balance of growth and results Good condition. Shanghai is located in the mixed zone of deciduous fruit trees and evergreen fruit trees. Ecological conditions for deciduous fruit trees, the accumulated temperature is high, the precipitation is too large, especially the early annual growth, positive deciduous fruit tree storage of nutrients, roots, branches, Leaf elongation and flowering are dependent on the previous year’s storage of nutrients. More rain and less light, more likely to lead to the strong growth of foliage, accelerating the consumption of assimilation substances, in a longer period of time greater than the new leaf manufacturing. Fruit hair