The third stage pruning of planting jujube is beneficial to increase yield.

First, the early fruiting tree. The crown of jujube tree has not yet been formed, and it is still dominated by vegetative growth, but the yield is increasing year by year. This period of pruning should be based on thinning, retraction, truncation and training, and should be pruned in accordance with the principle of "four retention and five no retention". "Siliu" means that the jujube heads in the periphery should be retained, the jujube heads in the backbone branches should be retained, the jujube heads with strong and promising development prospects should be retained, and the jujube heads with a large number of secondary branches, jujube stocks and strong fruiting ability should be retained, so as to achieve the goal of constantly expanding the crown and increasing the yield year by year. "Wubu" refers to no retention of drooping branches and weak branches, thin oblique branches and overlapping branches, disease and insect branches and dead branches, inappropriate and insubstantial overgrown branches, whorled branches, cross branches, parallel branches and long branches. The jujube head of the main branch which is not used as the main branch for more than 3 years and the jujube head of the main branch that is no longer extended. The bald backbone branches should be retracted and renewed gradually.

Second, jujube trees in full fruiting period. The crown has been formed, the growth potential is weakened, the crown is basically stable, and the fruiting ability is strong. In the later stage, the tip of the backbone branch gradually bent and sagged, crossed and grew, the inner chamber gradually withered, and as a result, the part moved outward. Therefore, the combination of sparse and contraction should be adopted in pruning to open the light path, draw light into the chamber and cultivate the inner chamber branch. Pay attention to the culture and renewal of the fruiting branch group to prevent the death of the inner branch and the outward movement of the fruiting part.

Third, aging jujube. For the renewal and pruning of aging jujube trees, the pruning method should be determined according to the weakening degree of tree potential. Results for the plants that just began to die in the branch group, the senescent branch group could be comprehensively retracted and thinned during winter pruning. Groups of branches that have been mutilated and bear few basal branches, sparsely removed from base. Other senescent branches group shrunk 1/3~l/2 and concentrated nutrients to promote new shoots. Jujube branches are soft and easy to droop. The drooping backbone branches can be retracted to raise the angle of the branches and enhance the growth potential. The degree of retraction is 1 × 3 or 2 / 5 of the length of the backbone branch. For the 1-to 3-year-old developing branches sprouting in the crown, the small and medium-sized branches were cultured according to the space size and leaving several secondary branches short. Results most of the senile trees in the branch group died and the front end of the backbone branches began to die, except for a large number of senile dead and incomplete fruiting branches, the retraction degree of the whole tree backbone branches (including the central trunk) was also aggravated. In general, it is necessary to retract to the length of the original backbone branch, but pay attention to control the diameter of the saw blade of the retraction part should not exceed 5 cm. Old trees that have undergone renewal and pruning should stop opening armour, reduce fruit, and strengthen fertilizer and water management to promote tree vegetative growth in order to rejuvenate the tree as soon as possible. In order to ensure the good effect of renewal and pruning, the aging trees were updated at one time. The effect of local renewal of branching system in turn is not ideal.