1. The principle of "leave the tree" pruning is that fruit trees are pruned and shaped with the branches, and no big cuts should be avoided. First, use bracing, pulling and other measures to open the angle, and select several large branches with good orientation or positions as the main branch or core. The extra large branches can be retracted and removed within 2-3 years. Large branches with space can be properly retracted and transformed into large branch groups. For the overdense vegetative branches on the center stem, we should go straight and stay oblique, go big and leave small, open the level, and use the vegetative branches of the bare parts of the backbone branches to form a result nucleus group to fill the gap. 2. "Wang Changshu" adopts the "reduced pruning method". First, the opening angle, the opening angle of the backbone branch and the supplementary branch is 75°-80°. Secondly, it should be lightly cut and slowly placed. The extended branches of the backbone branches at all levels should be kept for a long time, and the other large and long boards should be flattened and slowly placed, and then retracted appropriately after the flowers or fruits are formed. The overdense upright branches, competitive branches, and strong branches should be removed to facilitate ventilation and light transmission. 3. The "little old tree" should adopt the "help pruning method". That is to weaken branches, keep strong branches, increase the proportion of long branches, concentrate nutrients, and restore tree vigor. Retract perennial branches and raise the angle of drooping branches. The fruit branches in the extended branches of the backbone branches at all levels, and the nutrient branches with good growth are cut from the full buds. 4. Pruning methods for "big and small trees". When cutting the New Year tree in winter, in addition to shrinking part of the fruit branches to reduce the number of flower buds, some branches are also cut short, most of which are slowly released. When pruning a small tree in winter, more flower buds should be retained, and the branches should be trimmed more heavily to increase the number of short cuts, so as to concentrate nutrients, preserve flowers and increase fruit. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone Disposable Grasper,Disposable Forceps,Surgical Disposable Trocar,Disposable Laparoscopic Scissors ZHEJIANG SHENDASIAO MEDICAL INSTRUMENT CO.,LTD. , https://www.shendasiaomed.com