Because the jujube has a long flowering period and a large amount of flowers, the consumption is very large. In addition, the flower bud differentiation and the fruiting branch and the fruit setting are synchronized at the same time, which leads to the inefficient flowering of the jujube tree or a large number of falling fruits. The management steps are briefly described below for reference.
1. Top-dressing of jujube flowering: generally in late May, topdressing with quick-acting nitrogen fertilizer and appropriate amount of phosphate fertilizer. Generally, 0.5 kg of urea and 0.5 kg of ammonium dihydrogen phosphate are applied to each tree. After the fertilization, the flower water is poured and the soil is loosened.
2, jujube tree opening: generally in the flowering period of jujube trees (in mid-June) that flowering accounted for 30% to 50% of the total number of buds when carried out to promote young trees open armor. The first time the armored tree is placed on the trunk 20 to 30 centimeters from the ground, the area of ​​the open armor will move 5 to 10 centimeters annually. When the first main branch is reached, the above operation is repeated. The width of the mouth is 0.3 to 0.6. Centimeter is appropriate. The width of a strong armor tree should be wide and the weak tree should be narrow. When it is cloudy and rainy, it can be appropriately widened by 0.1 to 0.2 centimeters, but the width should not exceed 1 centimeter. After opening the armor, attention should be paid to the protection of A mouth. Every 1 week or so, apply a 100 to 200-fold solution of the insecticides such as Levospen. The slow healing process of A mouth is smoothed with mud, which is both insect-proof and moisturizing, which is beneficial to Healing. Kai Kao can also be used with new technology to promote the use of Kao 2, the use of time is about 20% of jujube bloom when using the first time, wait 30 to 35 days before using the second time.
3. Topping of jujube shoots: In mid-May to late June, the first branch and the second branch of the newly dated jujube without the backbone branches should be picked in time to control the growth of the development branch, reduce the nutrient consumption, and increase the fruit setting rate. Normal mature tree jujube heads grow to 2~6 secondary branches and pick the top heart. The second branch grows with the heart. The 3~4 secondary branches at the base of the jujube head grow to the 5~7th section and pick up the heart. 1 to 4 secondary branches grow to 3 to 5 knots.
The degree of topping is determined by the growth of the jujube head and the size of the space in which it is located. Generally, the weak branches focus on the topping of the heart, and the strong branches will lightly pick the heart. When the space is large, the heart will be lightly picked and the space will be weighed again. During this period, in addition to taking away the heart, it is also necessary to eradicate the jujube whose germination has no use value and remove it from the base as soon as possible, and eliminate the perennial branches with dense internal organs to save nutrients and facilitate ventilation.
4. Three sprays of jujube flowering period: First, spray fertilizer, spraying fertilizer in the flowering period of the date, spraying leaves 2 to 3 times 0.3% urea + 0.1% to 0.3% of potassium dihydrogen phosphate twice every half month. +0.2% to 0.3% borax mixed aqueous solution. Choose sunny morning or evening spray, especially the evening spray is appropriate, the amount of spray fertilizer to the degree of wet foliage, if the rain should be sprayed after spraying. The second is water spray, choose to spend 60% of the full bloom flower when open, the best time in the evening, with a sprayer evenly sprayed water on the jujube, water to wet the leaves for the degree. The number of water sprays depends on the degree of drought. In general, it is sprayed once every 3 to 5 days, and sprayed 2 or 3 times. The year of severe drought can be sprayed 3 to 5 times. The third is spraying plant growth regulators in the early flowering period of jujube trees. In full bloom, choose to spray 15 to 20 mg/l gibberellin solution or 15 to 20 mg/l naphthlene or naphthylacetate diluted or 5-10 mg/l 2,4-D1~ Two times, 30-60 mg/L of TCA or 30 mg/L of 2,4-D was sprayed twice in young fruit (20 days apart) to prevent its falling.
5, jujube tree pest control: in the flowering period of the harmful diseases and insect pests are mainly green-lipped stinkbugs, a beetle, red spider, peach small borer, Zaobuqu, date rust and so on. Before and after the wheat harvest is the best period for the control of spider mites. It can be sprayed with 1% zinc sulphate 5000 times liquid or 15% broom squeezing oil 2500 times liquid.
In mid-May and mid-June, the critical period for the prevention and control of the second generation of green-lipped iridescent elephants is to spray 1 or 2 times 20% of the swamp 2000 times, or 20% cyanomethoxate, on the trees and under the trees. 2000 times liquid + 10% imidacloprid 3000 times, can also hang black light trap adult.
In the middle and mid-June, peach-sucking moth-eaten traps were hung, and the peach moth was used to attract moths to peak after 5 to 7 days.
In the middle of July and mid-August, spray each time a germicide (200 to 240 times the amount of Bordeaux mixture and 50% carbendazim WP 800 times, 70% thiophanate-methyl WP alternating 1000 times) Prevent date rust and fruit diseases.
6, flowering bee beehive distance is about 300 meters is appropriate. During the period of bee-keeping, Zaoyuan is forbidden to spray penicillin, pyrethroids and other pesticides harmful to bees.
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