(2) Adjust the tree structure, enlarge the fruiting space, and make the trunk branches evenly distributed, the structure reasonable, the leaf curtains scattered and the layers clear through shaping and pruning, so as to make the inner room have good lighting conditions, prevent the inner room from being exposed, slow down the outward movement of fruiting parts, and increase the effective fruiting amount of the crown;
(3) Adjust the nutrition distribution, stabilize the yield, improve the quality, and avoid the occurrence of big and small years. By pruning, balancing the tree potential and adjusting the ratio of vegetative growth to reproductive growth, the goal of high and stable yield in successive years can be achieved;
(4) the tree is rejuvenated. By pruning, the weak old trees will regain their vitality and gain high yield again.
(5) Improving Fruit Quality The flower bud differentiation period of chestnut is different from that of apple and pear. The flower bud differentiation of apple and pear was completed the year before, while the female flower differentiation of chestnut was completed in the spring of that year. Apples and pears can improve fruit quality by pruning before flowering, thinning flowers, thinning fruits and bagging, while chestnut can only improve fruit quality and yield by pruning and controlling the number of branches. Too many branches are left, which affects the differentiation of female flowers due to insufficient nutrition; Sometimes, although the yield is high, the quality is too poor (the fruit is too small) and there are too few branches left, which affects the yield. Therefore, chestnut pruning is more important than other fruit trees.