1. Properly pruning and adjusting tree vigor The old tree should be cut early (before winter) and cut again. Cut away dead branches, stub branches, slender branches, charred shoots, pests and branches, and over dense shoots. More short cuts, promote the growth of shoots, heavy branches, competing branches should be short cut, the branches of 2/3 ~ 3/4 cut or leave only 3 ~ 5 buds. Early sparse flower buds, sparsely cut excessive flowering branches, and reduced fruiting. The young tree should be cut late (before and after spring), retain the flower branches, and sparse the vegetative branches without flowers. Put or pull branches for a long time, ease the tree potential, keep flowers and fruits as far as possible, and increase the amount of results.
2. Reasonable load, adjust the amount of results The big year tree must control the amount of its results. In the late spring and early summer, the fruit should be thinned, that is, about 50 days after flowering, the pests, deformed fruit, and tip fruit should be removed first, and then the leaf fruit ratio. Roughly 18:1. Can also be set according to branches: For large fruit, generally one short fruit branch leaves 1 fruit, that is to say the length of the base branch is about 10 centimeters to stay 1 fruit; for the middle fruit, generally one short fruit branch to leave one fruit, the strong branch to stay 2 Fruit, spacing 6 cm to 8 cm; for small fruit, leave one or two fruit on a short fruit branch, spacing 4 cm to 5 cm. Uniformly thinning the fruit in the whole tree to reduce the fruit load, promote the growth of branches and leaves, and ensure high yield in the small year. In order to improve the fruit-setting rate of Litchi, Xiaoyinshu can be used as a topping or thinning branch to control shoot growth, and artificial pollination and spraying of 2,4-D can be used in time.
3. The scientific fertilization tree should reapply strong fruit fertilizer and post-harvest fertilizer. After flowering, the fruit rapidly expands (about the end of May). The plant applies 50 kg of livestock manure, 0.3 kg to 0.4 kg of urea, and 0.3 kg to 0.4 kg of potassium sulfate to supplement nutrients and promote fruit development, shoot growth and flower buds. Differentiation. After fruit harvesting, strains of 20 kg of organic fertilizer, 0.2 kg to 0.3 kg of urea, 0.4 kg to 0.6 kg of superphosphate, and 0.3 kg to 0.4 kg of potassium sulfate are used to supplement tree consumption, which is beneficial for restoration of tree vigor and flower bud differentiation. To lay the foundation for the high yield in the following year. The young tree should be applied before flowering, and about 10 days before flowering, strains of urea 0.1 kg to 0.2 kg and potassium sulfate 0.1 kg to 0.3 kg should be applied. In addition, 0.1%-0.2% borax or 0.2%-4% urea can be sprayed during the flowering period to supplement the deficiency of tree nutrient storage, increase tree nutrients, increase fruit setting rate, and increase yield.
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