1. Hanging fruit trees. At this stage, the crown has not been formed yet, and vegetative growth is still dominant, but the production has increased year by year. Pruning should be based on sparse, retractive, short cuts and cultivation, and pruning should be carried out in accordance with the principle of “four stays and five staysâ€. "Four stays" is: The outer jujube head must stay, the jujube head on the backbone branch must stay, the jujube head that is robust and full has developmental prospects to stay, has a large number of secondary branches and jujube stocks, the jujube head with strong result ability must stay . This can achieve the purpose of continuously expanding the crown and increasing production year by year. "Five not stay" means that the pendulous branches and the weak branches do not stay, the thin oblique branches and the overlapping branches do not stay, the branches and dead branches do not stay, the improper positions and the unpractical branches do not stay, and the round branches and cross branches , and branches and leggy branches do not stay. The jujube head that does not make the extension branch of the main branch and the head branch of the main branch that does not continue to be extended after a short period of three years or more. Bare back bare branches. 2. Fruit tree. The canopy has already formed at this stage, the growth potential is weakened, the crown is basically stable, and the result is strong. At the late stage, the tip of the stem was gradually bent and cross-grooved, and the internal hemorrhoid gradually withered. The resulting site shifted outward. Pruning can be used to combine pruning, opening the light path, irradiating light into bracts, cultivating the inner litchi, preventing the internal shoots from dying and the resulting parts moving outwards, paying attention to cultivating and updating the result branches, and extending the result years. 3. Old date tree. With the increase of tree age, the backbone branches gradually withered, the crown became smaller, the growth became significantly weaker, the growth of the jujube head was small, the jujube hanging was short, and the result was significantly reduced. This aging tree needs to be pruned and rejuvenated. The degree of updating depends on the number of effective date stocks (ie live stocks). Jujube trees on the date of 300-500 in the effective jujube stocks should be updated to a more serious degree, that is, in the backbone of the growth of the strong branch, saw the total length of the stem branches 1/2-2/3, stop Raising the tree 2-3 years; when the effective jujube stocks are between 500-1000, medium-level update can be taken, sawing off 1/4-1/3 of the total length of the stem branches, stopping the tree maintenance for 1-2 years; effective dates When the stock is between 1000 and 1500, it can be lightly renewed, saw off 1/7 to 1/5 of the total length of the stem, and open it as usual.
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