Aging jujube tree update rejuvenation technology

Due to the older trees or poor management, the crown of the jujube grows sparsely and there are a large number of dead branches in the canopy. The growing tendency is weakened and the yield is reduced obviously. The rejuvenation should be carried out in time to increase the tree vigor and restore the yield. According to the aging of tree vigor, we should carry out mild update, moderate update, and heavy update.

1, slightly updated. When the tree just entered the ageing period, the growth of branches turned weak, the jujube stocks and secondary shoots began to die, the bare stems appeared light rods, and the yield showed a downward trend. When the whole tree is effective, about 1000 to 1500 jujube stocks should be lightly updated. In order to adopt a mild retraction method, the retraction site should be selected to leave a strong bud at the strong buds, cut or saw about 1/3 of the length of the main and side branches, and stimulate the left part of the new dates to form a new one. The results of the branches and groups; appropriate retraction of the debilitating result branches, and to eliminate the heavier aging secondary branches and dead branches, pests and branches, in order to restore the tree vigor. In order to maintain a certain amount of production, mildly updated can continue to moderately open.

2, moderately updated. When the tree body is significantly weakened, the second branch is massively dead, most of the backbone branches are bald, and about 500 to 1,000 dates are valid, and the yield is drastically reduced. When the yield is only 3 to 4 kg, moderate regeneration is required. The saw is retracted. In addition to about 1/2 of the total length of the stem branches, the result was that the bare branch was re-branched, resulting in new branches. It is necessary to stop the armor for two years and wait until the tree potential recovers.

3, heavy update. When the tree is extremely old, most of the shoots at all levels are dead. There are no or few new shoots in the whole tree. If the effective dates are less than 500, when the strains produce 1 to 2 kilograms, it is advisable to carry out heavy updating. About 2/3 of the time is long enough to stimulate the initiation of new shoots and to re-form the canopy, which should be stopped for 2 to 3 years.

The renewal of senescence trees should be completed in one operation. It should be carried out in March before the germination. Such stimuli are heavy, and the number of branches is large and tidy. It is easy to select the backbone and the resulting branch, which is conducive to the rapid formation and expansion of the canopy. In the process of pruning, attention should be paid to the affiliation of branches at all levels. The trunk should be higher than the other main branches. The main branch should be longer (higher) than the other branches, and the upper branch branches should be higher than the lower branch branches. Branches grow balanced. Larger saw cuts should be painted or waxed to protect them from nicks greater than 5 cm in diameter. After the aging tree is renewed, fertilizer and water management should be strengthened to increase the nutrient level of the tree and ensure that it receives the expected results.

In the first year after the pruning of the aging tree, it is necessary to retain the leaves and leaves, to eliminate the useless jujube heads on the trunks and stems as soon as possible, so as to save nutrition; when the growing jujube head grows to 60-70 centimeters, it will be picked up. In the second year after the renewal, the jujube heads were adjusted to extend the branches of the branches to maintain the proper orientation and angle; the other jujube heads were picked or short-cut, and the collateral branch and the result branch group were cultivated, so that the branch amount in the crown was distributed. Uniform, forming a reasonable tree structure.

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