The replacement of old fruit trees and inferior tree species in spring will be able to achieve the purpose of improvement, and fruit trees will be enriched, early results and high yields achieved. There are three main methods for replacing the head: 1. Wiping the whole tree. Apply a one-time wipe to the entire tree to reduce the grafting area as much as possible. For trees that have been reshaped, if the main branch is longer than the other branches, the kerf does not exceed 70 mm in diameter, and lateral branches and other branches may be appropriately short-held. The branches on the stem should be about 90 mm. For trees that have not been shaped or improperly shaped, the branches with strong growth potential and good azimuth angle are selected as the main branches. The appropriate branches are selected as the lateral branches on the main branch, and the other branches are retracted to the internal fistula as the auxiliary culture. Second, careful grafting. The method of grafting is: the subcutaneous abdominal connection can be used for internal hemorrhoids and the main bald area. The use of "snapping" is not easy to peel off the "skin under the branches", which is easy to strip at the kerfs. If the rootstock is thick, you can pick two ears. There must be a few full shoots on the scion. After being grafted, they were tied with clean plastic film strips to expose the buds of the scion buds so as to facilitate the new shoots. Third, strengthen management. After grafting, the survival condition should be checked frequently. If the phenomenon of dry scion is found 15 days after grafting, a re-graft can be cut off from the original interface. The buds of the bud of the original tree can be bred to a height of about 150 mm when the buds can be cultivated, and the buds can be plucked and promoted. The rest of the buds were erased. When the shoots on the scion are about 250 mm long, use a few branches or bamboo sticks to fasten the shoots to prevent wind blows. When the rope is longer than the cortex, it should be replaced in time. For the new shoots that are used as auxiliary branches, the tree vigor can be relieved through twisting tips, opening angles, etc. to promote the formation of flower buds and advance into the result period.
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