1. After planting jujube in intertillage and weeding, before enclosure, it is feasible to interplant crops and medicinal materials in the comprehensive land preparation afforestation site to replace cultivation with protection; Strip soil preparation, weeding with intertillage, three times a year, that is, in the middle and late April, May and July, the weeds removed should be buried around the plant rhizosphere as fertilizer. After the trees are closed, intertillage and weed for 1 time in the first half of May every year in summer, and dig deep into the soil after autumn to reach a depth of more than 30 cm. Coupled with ploughing and fertilization, the soil is mature. You don't need to turn the land every year, but turn it 1 time every 3 ~ 4 years.

2. The flowering period of water-sprayed jujube is often affected by climate drought and dry hot wind. If the water source conditions are good, you can choose to irrigate in the field in sunny afternoon or evening. If the conditions are limited, you can spray clear water 1 time to jujube every 3 ~ 5 days with a sprayer to reduce flower dropping and improve fruit setting rate.

3. Top dressing jujube is more barren resistant. After planting and before flowering, each plant can grow well only by topdressing 1 time in the first and middle of May every year. When entering the fruiting stage, due to the high consumption, it is necessary to increase the number of fertilization times, fertilizer types and fertilization amount every year, that is, topdressing the roots with 0.5% ~ 1% mixed solution of urea and potassium dihydrogen phosphate in the annual growth period, 1 time per month. After harvesting the fruits in autumn, 30kg of manure or soil miscellaneous fertilizer, 0.5kg of calcium superphosphate 1 kg, 0.5kg of ammonium bicarbonate and 0.3kg of potassium chloride were applied to each plant, and furrowing was carried out along the rhizosphere. It can restore tree vigor, reduce fruit drop and increase yield.

4. Spraying plant growth hormone at flowering and young fruit stage can improve the fruit setting rate and yield of jujube. For example, spraying 65,438+00 mg/kg NAA or 8 ~ 65,438+00 mg/kg 2,4-d at the flowering stage in early June; Spraying 30 mg/kg 2,4-d or 50 mg/kg NAA every 3-5 days and twice in a row during the young fruit period in mid-July can increase the yield by about 25%.

5. Picking jujube heads When the newly-grown branches (jujube heads) are more than 30 cm long at the early flowering stage, the jujube heads without regenerated branches are pitted, leaving 3-4 secondary branches, which can germinate strong fruiting branches. This is the main fruiting branch of jujube, which can bear fruit continuously for a long time. Because the jujube head is pitted, the vigorous growth of jujube head is controlled and the nutrient consumption is reduced, so the fruit setting rate and yield can be improved.

6. The flowers of Zizyphus jujuba are insect-borne flowers. Releasing bees at flowering stage is beneficial to pollination, which can increase the fruit setting rate by about 1 times and increase the yield by more than 20%.

7. girdling can improve the fruit setting rate 1 times. The method is: in full bloom, cut a circle at the place where the trunk is 65,438+00 cm from the ground, reach the xylem, cut it every 0.5 ~ 0.6 cm, and then peel off the bark between the two circles. The appropriate girdling width is 0.5 ~ 0.6 cm. The wound began to heal about 20 days after girdling, and the wound healing surface reached more than 70% after 1 month.

8. Trimming is very important to improve the yield and quality of jujube. Therefore, plastic pruning should be carried out in the second year after the survival of colonization. It is better to stratify the trunk of jujube tree with high yield, because it conforms to the natural growth habit of jujube tree. Jujube pruning is mainly to cultivate jujube rootstock, because jujube rootstock is the main fruit-bearing part of jujube. The specific methods of jujube shaping and pruning are as follows.

(1) In the second year after the young trees are pruned and planted, they are cut off at 80 cm from the ground, and 3-4 robust branches are selected at 20 cm below the cut off to cultivate the first layer of main branches, so that they spread around in a radioactive way to form the first layer of crown. The upright branches growing on each main branch can be cut off from the base; Parallel twigs can be retained to facilitate the growth of main branches. The first two branches on the main branch and side branch of jujube tree should be kept, because this is the main fruit-bearing part of jujube tree. Topping the branches that have been extended continuously for 3 years (that is, removing the main buds) is beneficial to the secondary rejuvenation of jujube rootstocks on the branches. In the second year, 3 ~ 4 strong branches were selected from the new branches issued in that year, and cultivated into the second layer of main branches to form the second layer of crown. In the third year, two main branches are selected to cultivate the third crown, and the spacing between layers is unequal, which should decrease in turn. The first layer is 50 cm, the second layer is 40 cm, and the third layer is 30 cm, so that the height of the whole tree can be kept at about 2 meters. After three years of shaping and pruning, a high-yield tree can be formed.

(2) Pruning of Adult Trees Every winter, the dense, intersecting, overlapping and erect branches of overgrowth, pests and diseases should be cut off in time to balance the tree potential and improve the permeability in the crown, and the drooping branches should be properly retracted to make the re-sprouted jujube trees look up and continue to expand the crown.

(3) During May and June of the year when the old trees were updated and pruned, 65,438+0 jujube heads were selected every 60 cm. Except the top jujube head continued to elongate, all the others were topped to promote the new jujube rootstock to keep the tree vigor and continue to bear fruit.