Detailed Explanation of Key Techniques for Renewal and Rejuvenation of Old Jujube Trees
Bending branches to open the angle. For relatively upright branches, bending can change their direction, disperse growth polarity, slow down the momentum of vegetative growth, and enhance ventilation and light penetration in the canopy. Removing sprouts and pinching tips. For newly sprouted useless jujube heads, when there is no space for development, they can be wiped off from the base, leaving only 2-3 jujube bearing shoots at the base. ...
When renewing old jujube trees, long and thin weak branch groups should be cut back for rejuvenation; dead and weak branches with no useful value should all be thinned out; old wounds or stubs from broken branches should be cut smooth and trimmed, and a protective agent should be applied. Specific pruning varies from tree to tree.1. For trees where large branches are generally severely bare with no usable secondary scaffold branches in the middle and lower parts, select two tiers of main branches according to the open-center layered form, or select 4 to 5 main branches according to the round-headed form, and cut back each by 2/3 to 1/2. If there is no branch below the saw cut, select and retain 1 upright or slanting jujube spur, and at its base choose 1 jujube bearing spur with a suitable direction and cut it short as the cut-mouth branch.
2. For old branches where the large branches are not too severely bare, it is best to retain both the main branch and lateral branch levels of scaffold branches, and then cut back the main and lateral branches according to the above method.
3. For large branches where both the large branches and the trunk are damaged and unusable, but the root system is still good, they can be sawed off at ground level to induce root suckers. In the same year they can grow to more than 1.5 m, faster than replanting young trees. In summer, remove the sprouts, select and retain one or temporarily two root suckers, accelerate wound healing, and mound soil for protection to prevent breakage or damage.
When renewing old trees, no matter which method is adopted, soil, fertilizer, and water management must be strengthened.