In the past ten years, mangoes have been planted on the mountains in the south, and the production has developed rapidly. However, large trees and new trees planted for many years require high yields due to poor quality or mixed varieties and low yields. The method is as follows: 1. Prior to preparing for change, the management of fertilizer and water should be strengthened for changing trees. The ground part is properly trimmed, with diseased branches, dead branches, vaginal branches, and dense branches. Cut off the branches; for perennial trees, in the spring and autumn 1.2-1.5 meters above the ground, saw the main lateral branches (spring sawing and autumn grafting, autumn saw grafting in the next spring), leaving part of the twigs. After slicing and squeezing new shoots, only 2-3 new shoots are evenly distributed in each kerf, and when the new shoots are old and mature, their diameters are 0.5-0.8 cm or more, and they can be grafted on new shoots. In the first 15 days, fertilization should be stopped, slowing the flow of sap and facilitating grafting. Second, the grafting period when the sap is about to flow, that is, before the new shoots are drawn out, the rootstocks and scions are grafted when they are easily stripped. High-temperature, low-temperature or rainy days, high grafting, the survival rate is low, and spring access (3-4 March) and Qiu (mid-August to mid-September), the survival rate of up to 90%. In May, although high-yielding varieties can survive, when they survive germination, they are experiencing high temperatures and are prone to withering. In October, high-resistance can also survive, but at this time, droughts are encountered and the temperature gradually declines. Low temperature, slow growth, and even new shoots will appear frostbite or frozen to death. Third, the high-resistance method from the results of the mother on the fine branch, the choice of thick old tree branches, pest-free old mature branches or cork branch for scion. The methods include bud-patch attachment, single-shooting shoot belly-jointing, and single-shoot cutting connection method. The tree is not short-branched. It is connected to the original shoot at a height of 1m to 1.5m above the ground, and is budded or budded. Branches and abdomen; new branches have been truncated, using cut-connection method, buds can also be used to paste the law. When grafting, it is best to use a thin film for dressing. The single-layer film encapsulates the sprouting buds of the bud, and after germination, the sprouting bud can pass through the thin film to grow and reduce the picking process. Fourth, timely release of grafted graft survival, should not be released too early film, otherwise the new shoots will wither. Generally, it is safest to untie the first time the new shoots turn green. Too late to untie them will affect the thickening of rootstocks and scions, and it will cause decay. Buds and connective buds should be in 30-40 days after the connection, first cut off the 8-10 cm on the interface of the branches, until the buds become old mature branches and then untie the second, and the second Secondary anvil, that is cut to the top is appropriate. China Agricultural Network Editor
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