Expert Chen Yunqi answered: This kind of aging tree should be updated and rejuvenated in time to make the old tree rejuvenate, improve the quality of branches, buds, leaves and fruits, prolong the life of the tree, and let the old tree once again "sunset red". The tree of aging tree has poor ability to absorb nutrients, consumes large nutrients, and generally aging branches. The pruning should be based on renewal and rejuvenation. The results should be subject to the principle of renewal. When pruning, control should be taken as the main control, and control should be combined. Main, light and heavy combination.
1. Transform the tree shape. The central branches of the aging tree should continue to fall back and contract, reducing the height of the tree, and compressing the layered tree into a single layer of happy shape. Or compress the back of the second main branch of the layered tree to half. Or replace it with the auxiliary tree branch between the lower layers to form a single-layer "convex" shape. The tree that is not layered is transformed into a delayed happy shape.
2. Retract the perennial old and weak branches. It can be updated by the update method of the front plug and the cut, and the light is retracted at the 2~3 branches in the front part of the big branch, blocking the water, pressing the advantage to the lower branch, and cutting the lower half of the branch. In order to increase the number of new branches, restore the growth potential. In order to carry out major renewals in different years, it is necessary to first branch the branches, retract as much as possible, update 1 to 2 large branches every year, and complete the renewal of the whole tree in 3 to 4 years. If you take a one-time big update, you will retract all the big branches at once and rebuild the new canopy. In the process of large-scale renewal, for all the large number of new shoots issued, we must first select new backbone branches, open the angular orientation, and even mid-year and short-cut, promote growth, cultivate new canopies, and cultivate by pulling, other, pressing and other methods. The result is a branch group.
3. Twig updates. On the basis of the update of the big branch, the twigs were renewed at the same time, and the new shoots sprouted from the small update were selected as new backbone branches for cultivation, and some were cultivated into the result branches. For the generally weak branches, leave the shoots and strong shoots, and retract and retract to promote new shoots. When winter shearing, the flower buds should be kept proportionally, and the load of the tree body should be reasonably controlled.
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