1. Trim and cut dry
(1) First- and second-tiered frost-damaged trees with proper early shearing or late shearing have little effect on restoring tree vigor, but it is advisable to prune when germinating. And the principle of light pruning leaves more green leaves, mainly to the short cut. For the shoots inside and under the canopy, keep as many results as possible. When the spring shoots are cooked in May, the fine branches and dense shoots that are not the result of flowering can be properly cut off to concentrate the nutrients, increase the fruit setting rate, and promote fruits. Inflated.
(2) Three-level frost damage should not be pruned early, and the temperature should be stable at more than 10°C. After germination in spring, it is appropriate to judge the boundary of branch life and death. When pruning, the main part of the leafless branches is mainly short, with the sparse deletion as the supplement, to promote the development of new shoots and accelerate the formation of green leaf layers. The degree of pruning is based on the principle that new shoots with moderate growth can be grown. Make sure that the cut and saw parts are shaped from the entire tree to facilitate the cultivation of high yield trees.
(3) The pruning and cutting of the quaternary frost-damaged tree should not be premature, and the re-frozen tree should be cut off prematurely, the germination rate should be weakened, the germination site should be reduced, and the survival rate should be significantly reduced. Can be selected after the new shoots in the branch or main trunk survival site for heavy shear or cut dry.
(4) Cutting and cutting Note: Cut (saw) treatment: Cut the wound and diseased part first, and then make a smooth one. Then, disinfect the wound with 75% alcohol or 0.1% potassium permanganate, and then apply the protective agent. Protective agent: Available fresh cow dung (60% to 70%), yellow mud (20% to 30%), lime (5% to 10%), tune into a paste and serve. It can also be applied with butter (added to thiophanate or carbendazim at 2%). Or apply wax. Trim position: For larger branches should be selected in the shear (saw) around the mouth around the uniform distribution of buds, to avoid the tissue near the cut and then dried down. When sawing big branches, it is necessary to prevent new shoots from being injured and cracks in the scalp. For the cutting of the smaller branches, the place where the buds are to be taken out on the festival should also be selected. New shoot control: For excessive shoots of adventitious shoots that germinate at the shoot stage, they must be erased or cut. In the upper part of the canopy, the shooter shoots. It is optional to leave the appropriate position and the appropriate length for topping to promote more branches and speed up the formation of the crown. As a result of tree pruning: red plum pomelo and other varieties with strong branching erection can be combined with a dwarf happy tree to be trimmed. In the process of cutting the canopy, such as the mandarin oranges and citrons, the opening of the canopy, attention should also be paid to opening the skylight, improving the light conditions in the interior, dwarfing the pruning, and developing a compact tree shape.
2. Post-freezing comprehensive nursing measures
(1) The frozen red meat grapefruit garden should be timely cultivated and loosened and drained in spring, and in summer and autumn, attention should be paid to the control of resinous diseases, anthrax and other pests. In particular, resin and cold injury, the wound is an important condition for the epidemic. Therefore, attention should be paid to the treatment of wounds after freezing, and the lesions on the trunk can be scraped off before applying the medicine. Pharmacy use 50% carbendazim 100 times, 50% thiophanate 100 times, 1:4 food alkaline water, 80% zein zinc 20 times, etc., and the treatment period is from April to May and from August to September. Once a week, each treatment 3 times.
(2) Plants with lighter, more deciduous shoots on the shoots often exhibit excessive flowers and weaken the tree vigor. In order to ensure the rapid restoration of trees and appropriate results, they can be cut before flowering at the budding stage. Part of the results of the mother branches and flowering branches with low fruit setting, in order to help reduce tree nutrient consumption.
(3) Strengthen underground management. If the shoots are frozen, they will not bloom, but the plants whose roots are still normal should adopt the measures of renovating the foot base fertilizer under the ground, which means that the ground and the underground are updated at the same time. Plants with a certain amount of flowers and plants that are lighter in freezing should also be intensively ploughed and turned to base basal fertilizer. Top dressing can be based on the freezing degree of red pomelo teak tree, tree vigor recovery and growth status, and grasping the principle of combination of thin-fertilizer ground-dressing and top-dressing and top-dressing, and before bud, flower, fruit enlargement period and each new shoot period. Timely and appropriate topdressing. If necessary, spray additional zinc, manganese, boron and other fertilizers. Http://
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