Pay attention to the following aspects when pruning winter jujube trees: 1. Pruning should be done after defoliation. The most suitable pruning time for winter jujube trees is the dormant period from defoliation to spring germination. During this period, the physiological activities of the winter jujube tree are slow, and most of the nutrients in the tree have returned to the roots. At this time, the nutrient loss of pruning trees is less. The trimmed wound is not easy to be infected and rotted by microorganisms. Second, avoid pruning in the cold. Pruning should not be carried out in cold winter. Pruning when the temperature is too low will freeze the juice of the wound and affect the recovery and growth of trees. The cracks in the old bark of jujube trees are wintering places for jujube armyworms, jujube heartworms and harmful fungi. Red (cork layer) should not be exposed to rl (cambium) when the old bark of the main T: and the base of the main branch is scraped off with a sickle in winter. Scraped bark should be burned centrally to eliminate overwintering pests and germs. After scraping the bark, use lime, salt and water (the ratio is L: 0.8: 65433). Jujube is the backbone branch, such as the central trunk and main lateral branches, which should be cut short. The purpose of the day is to stimulate the new branches with good quality, ensure that the branches continue to elongate, the crown continues to expand, and at the same time increase the number of branches. Jujube trees are insensitive to pruning. After the extended branches are cut off, the first "Nong Wa Chu} 2005+0L" should be cut off. Instead, you have to cut two scissors, that is, cut them short at the branches of a specified length first. Then leave a short pile of 0.5- 1 cm for the first cut secondary branch and cut it off. Only in this way can the main bud (axillary bud) at the branch planting place grow strong and developed branches like the terminal bud. That is to say, the jujube head branch continues to extend in the direction of the original branch, and sometimes even branches are carved above the main bud to increase the degree of stimulation. This is a principle that jujube trees should follow when truncating trunk branches and lengthening branches. Fifth, reasonable pruning. Adjust the roof. Jujube trees are fond of light, and the trees are full of branches and leaves, which is easy to cause less fruits and poor quality. Therefore, it is necessary to adjust the crown by pruning, and the following points should be done when pruning: ① Prune the branches with low J, and sparse the cross branches, dense branches, heavy branches and weak branches to facilitate ventilation and light transmission. For long branches, the size of J space and the length of pruning can be determined. For long branches with large space and good cultivation prospects, they can be cultivated into branches (all dead branches, pests and diseases are sawed off). ) incision should be leveled and coated with ready mixed paint to avoid further cracking. ③ For the main branch of 1 ~ 2 years old, if there are two bone branches =r, it can be pruned according to the space size, leaving 4~6 secondary branches. When they are cultivated into robust fruiting branches, the aged branches should be renewed and updated. The thousand branches of aged bone should contract by L/3 ~ 1/2 at the same time. The diameter of the incision in the retraction part should not exceed 5 cm. It is necessary to leave upward dormant buds or fruiting mother branches under the incision. As a result of aging, the branching group should be fully retracted and thinned, and the more complete branching group can shrink 1/2- 1/3, which promotes new branching.