At present, high-temperature and dry weather for several days has brought a great impact on the normal growth of jujube trees that have just entered the young fruit period. Failure to strengthen management in time will bring about a certain loss of jujube fruit production and quality.
1. Watering fertilizer. Jujube tree growth is now approaching a water shortage, especially winter jujube, and all equipment should be used to promptly quench the jujube tree in critical stages of young fruit growth. At the same time, according to the growing potential of jujube trees, nitrogen, phosphorus, potassium, iron, boron, calcium, zinc and other elements required for normal growth of jujube fruit are supplemented. In general, each fruit tree will be treated with 0.4-0.5 kg of diammonium phosphate and 1 kg of potassium sulfate. Fertilizer can be sprayed to improve the fertilizer utilization and absorption rate, such as spraying urea solution, potassium dihydrogen sulfate solution and so on.
2. Prevent fruit drop. In the late stage of fruit enlargement, fruit often has fruit drop due to insufficient nutrient supply. In order to reduce fruit drop, in the middle and early July, the crown sprays 20ppm naphthylacetic acid with 0.3% potassium dihydrogen phosphate solution. If there is a deficiency of nitrogen, 0.3% urea solution can be added. Spray together. Once every 7 to 10 days, spray 2 or 3 times.
3. Pest control. The insect pests in this period are mostly green-lipped animals and red spiders. Special attention should be paid to prevention and control. If they are not controlled in time, serious leaf fall and fruit drop will result. Can be used 2000 times fast insect liquid or Wanling 3000 times solution + 1.8% avermectin EC 3000 times, 5 to 7 days once. The main diseases of this period are date rust, fruit shrinking, and rotenone, and can be controlled by using M-45 Taisho, or methyltropine and triazole copper 800 times. It is also possible to use 25% triadimefon or a multiform Bordeaux mixture (1:2:200) for control. Every 7 to 10 days thereafter, the fungicide is sprayed again according to the precipitation, and Bordeaux mixture is better when used alternately with other fungicides. When spraying fungicide, attention should be paid to the quality of the sprayed cloth. The crown can be sprayed up and down, inside and outside, especially on the back of the leaf, in order to improve the control effect of the disease. In addition, jujube trees with severe iron deficiency are supplemented with iron, and 20-30 g of chelated iron per plant or diluted 1500 times can be sprayed.
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