Dongzao Kaijiao time: Although Dongzaojiao can increase the rate of fruit set, it also has side effects of inhibiting root growth and tree vigor. Therefore, young jujube trees with small crowns, unshaped trunks, and fine trunks cannot be opened prematurely.
The trunk diameter of the armored tree should generally reach 10cm or more. Under the conditions of dense planting and cultivation with high fertilizer and water, trunks with more than 4 years old and trunk diameters of 6cm or more can be used for trunk opening. Weak trees and 4-year-old saplings are strictly prohibited. The most suitable period for the winter jujube tree to bloom is the early stage of flowering (before and after awning), that is, when most of the jujube hanging from the whole tree opens 5-8 flowers, the flowering quantity accounts for 30% of the total buds.
The method of opening A: The armor is usually carried out on the main trunk, and when the big branch is too busy, it can also be opened on the base. The initial opening should be carried out in a smooth part of the trunk about 20cm away from the ground. After that, it is to be opened 3~5cm above the previous year in the previous year. It will reach the main branch at the decentralized office, and then it will open upwards from the base. In A, A is generally not coincident). In the previous year, when armor weakened, it was necessary to stop the armor and raise trees. When the armor was opened, the old bark of the open armpit was scraped off with a hook of eucalyptus to reveal the pink phloem tissue. Then two knives were cut with an open knife. The width was generally 0.5.39cm deep to the xylem, and the circumcision was removed after opening. Between the phloem tissue.
After armoring, wrap the mouthpiece with a plastic strip to keep it in a good small environment and produce callus as soon as possible while avoiding the accumulation of rainwater and liquid medicine.
When the head reaches the required length, it will be picked up and picked up.
1Cultivate the jujube head of the large-scale branch, pick up the heart when there are 4-7 secondary branches, and pick the side core when the secondary branch is around 6 knots.
2 To cultivate the jujube heads of small and medium fruiting branches, pick up the hearts when there are 3-5 secondary branches, and pick the side hearts when the secondary branches grow to 35 knots.
3 For jujube heads that are not used as a result of branches and branches, the earlier the heart is picked, the better. Generally there are 2-3 jujube hangings after picking.
The jujube heads that were grown upright and picked up after pulling the branches took them in a horizontal state at the beginning of June (before flowering), inhibited the formation of auxin at the shoot tips, controlled growth and accumulation of nutrients, and promoted flower bud differentiation and fruit set rate increase. If the tree is crowned or one side is missing, the branches can be adjusted to enlarge the result area. In early May, we asked the heads and fruiting branches of all levels to inquire into the jujube heads. If no long branches and fruiting branches are cultivated, they should be removed from the base.
Sweeping shoots can save nutrients, increase tree vigor, and help increase the fruit setting rate. When the air relative humidity is lower than 60%, the pollen germination rate will be significantly reduced. The best time to spray water is in the evening, and the effect is the worst before and after noon. The number of water sprays is usually 2-3 times (between 3 and 5 days), and the number of water sprays can be appropriately increased during severe drought.
The circumcision is carried out on saplings that are not suitable for opening. When the tree vigor is more prosperous, it cuts two knives. When the tree vigor is weak, it cuts a knife. The most suitable period for ring cutting is full bloom. The jujube head topping the new hair jujube head, breaking the growth polarity of the shoot tip (the stem tip contains more auxin substances), inhibiting the excessive growth of the jujube head, so that more nutrients flow to the floral apparatus to promote fruit set. The jujube head topping can be carried out in batches from early May to the end of July. Spraying plant growth regulators at the flowering stage can increase the fruit setting rate by 20%. The use of rare earth elements in buds, flowering stages, and young fruit stages of winter jujube trees can not only increase the fruit set rate of winter date, but also increase the chlorophyll content of the leaves, thereby increasing the disease resistance of the tree (joy leaf disease, rust) and insect resistance (jujube leaves Tick, red spider) ability.
Zaoshu flowering period do a good job in the above management work, can effectively increase the fruit setting rate, thereby increasing the output of winter jujube.
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