1. Extra-root fertilizer: Spraying 0.3% urea and 0.5% potassium dihydrogen phosphate from August to September to improve the photosynthetic efficiency of the later leaves, which is conducive to tree nutrient accumulation.
2, anti-crack fruit: watering 1-2 times in August, so that jujube trees often keep the soil moist to reduce cracking. Before the end of the rainy season, under the cover of the tree to protect the plastic film, it can prevent the white maturation period caused by the sun burn marks, to avoid the fruit coloring period of rain exposed from the scar into the flesh, resulting in cracked fruit. Nitrogen fertilizer is sprayed at the late stage of fruit growth to stagger the mature and cloudy days and prevent cracking. From the beginning of September until the harvesting period, 300 mg/L calcium chloride solution was sprayed every 10-20 days.
3, autumn Shugan: After harvesting, the winter scissors need to cut off the leggy branches, overlapping branches, over dense branches sparse, reduce the amount of winter pruning and sparse branch nutrient consumption, increase the tree's nutrient reserve.
4, anti-autumn: When there is more water in the autumn orchard, it is necessary to quickly clear the drainage ditch, promptly remove the accumulated water, dry the upper neck of the neck and open it to dry, prevent the root neck from rot, and prompt the root system to restore vitality as soon as possible.
5, control pests:
(1) Prevention and treatment of jujube disease. Diseases should be controlled to spread, and it was found that the mad twigs were immediately rooted to eliminate the source of the disease and control the spread of the disease. For jujube trees with light onset, holes were drilled in October to receive a rubber tube, and 50010 ml of tetracycline or oxytetracycline was injected into the tree with pressure or infusion.
(2) Prevention and treatment of jujube fruit disease. The first medication was taken in early August and another 1-2 doses were sprayed every 7-10 days. For bacterial jujube fruit disease, in the mid-August spray streptomycin 70-140 units / ml or oxytetracycline 140-210 units / ml, can also be used to prevent and treat kanamycin 140 units / ml; on the fungal jujube Shrinkage disease, can be used 75% chlorothalonil WP 600 times, in the peak incidence before spraying 50% jujube fruiting WP No. 1 600 times liquid control.
(3) prevention and treatment of jujube anthracnose. In the middle and late August, spray 1:2:200 times Bordeaux mixture.
(4) Prevention and treatment of peach borer. At the beginning of July, early August, mid-August, and late August, each sprayed once. The commonly used agents are 2.5% deltamethrin 3000 times, 2.5% kungfu emulsifiable concentrate 3000 times, or 20% extinguishing emulsion 2500-3000. Double fluid.
6. Fertilization deep-turning: In September, 100-150 kilograms of decomposed ring fertilizer should be applied to the outside of the canopy using a circular method, and some chemical fertilizers should be properly mixed. The depth of fertilization should be 50-70 cm, and deep-expansion at the same time, ripening the soil, Changing the physicochemical properties of the soil is conducive to maintaining water and fertilizer, deepening the root distribution layer, and enhancing the root absorption capacity.
7, grass cover: arid saline alkaline garden covered with wheat straw, wheat stubble, etc., with a thickness of 20 cm, can prevent evaporation of water, increase the amount of saline, thereby playing a role in improving soil, increasing soil temperature, extending root activity time.
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