Fruit planting is an effective technical measure to rapidly adjust the structure of fruit trees and transform low-yield orchards. However, some orchards have a low survival rate after they are changed, or have poor growth after survival, and some have died of wilting after 2 to 3 years of survival. The main reasons are as follows. First, the tree is weak and high, and the tree age should not be too large. The tree vigor should not be too weak. Must use young trees with a tree age of under 20 years, strong tree vigor, many branches and even distribution. There are two principles that should be mastered in order to change the type of connection. First, the tree canopy should not be removed once, otherwise it will cause the death of rotten roots; the second is to reduce the interface as much as possible, so as to avoid emptiness after changing the species. Second, if the number of scions is too small, the number of scions will be too small, the photosynthetic products synthesized after survival will be less, and they will not meet the needs of the tree and cause death. Large trees with a canopy over 5 meters in diameter should be grafted with 100 to 120 scions; medium trees with a diameter of 3 to 4 meters should be grafted with 60 to 80 scions; small trees with a diameter of 3 meters or less should be grafted with scion 25 to 40. Third, the affinity of weak affinity scion and interstock affinity is an important factor affecting the survival rate of high graft survival rate and survival is good. If the Chinese pear is connected to the pear, the middle anvil will be swollen and discolored, with a rapid decline and a short life span. The Red Fuji apples are connected to Da Guoguang, Hongyu and other varieties. The survival rate is high and growth is strong. They are connected to Jin Shuai, Marshal and other varieties, and the survival rate is low and the growth is weak. Four, early results with high access to take more flowers bud scion and long scion, can be earlier results. However, the vegetative growth of the tree is inhibited, which is not conducive to the restoration of tree potential, and even leads to premature aging and death. In general, shorting of two buds should account for 50%, and scions with floral buds and long scions with 4 to 5 buds each account for 25%. V. Inappropriate management Before the high connection, deep orchard should be carried out to promote root growth. When new shoots of citrus, bayberry and other fruit trees grow to 5 to 7 leaves, the shoots should be picked up in time to grow strong and strong branches when they grow to 4 to 6 leaves. After the fruit trees are tall, the branches will lose their shade and will cause cracks and dryness due to sunlight. They should be protected. At the same time, we must do a good job in pest control and fertilizer and water management.
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