Seedling management pay attention to topdressing and pest control. The sour jujube seedlings planted this year have the fastest growth in the hot and humid season. At this stage, the urea should be seized in time for 1~2 times, with an interval of about 20 days, and the amount of mu should be 7~10 kg to promote growth and timely weeding and weeding. In the prevention and control of pests and diseases, pay attention to red spiders and jujube armyworms. Choose 2% avermectin 4000~5000 times solution, 20% fenpropathrin 1500~2500 times solution, 10% bifenthrin 2000~3000 times solution. Prevention and treatment. For plants that grow rapidly and have a height of more than 60 cm, they can be lightly topped to promote thickening.
In the same year, the grafted seedlings generally do not follow up with nitrogen fertilizer after August, and the potassium leaf dihydrogen phosphate can be applied to the leaves every time the pests are controlled. The concentration is 0.2%~0.3%. After the seedling height reaches 1~1.2 meters, it is moderately topped to promote thickening growth.
The result period is carefully trimmed to prevent disease. 1. Reasonable fertilization: At the beginning of August, no nitrogen fertilizer should be applied to the jujube trees with normal growth and normal results. Phosphorus and potassium fertilizer should be applied appropriately. Generally, the diammonium phosphate is 0.3~0.5 kg. The jujube trees with many results and weak growth can be applied more appropriately. The fertilization amount of winter jujube should be slightly larger. At the same time, the multi-element foliar fertilizer such as potassium dihydrogen phosphate and photosynthetic micro-fertilizer should be sprayed 2~3 times in combination with spraying leaves to promote the rapid growth of young fruit.
2. Timely summer shear: Jujube is a hi-light plant, and poor illumination will bring the tree length, weight loss, and high incidence of pests and diseases. In mid-August, it is necessary to promptly remove the dense branches, long branches, pests and branches, and weak branches. In addition to the jujube heads with the responsibility of expanding the crown, all the hearts should be properly selected to improve the light conditions and nutrient distribution of the trees and promote the fruits. Accelerate growth.
3. Scientific prevention and control of pests and diseases: high temperature and humidity, a variety of pests and diseases, August is the peak of the disease of jujube fruit, jujube rust, anthracnose, shrinking fruit, peach heartworm, red spider, green blind elephant, jujube Period, to target medication. Use triazolone 800 times solution plus 20% fenpropathrin 1500 times solution to control jujube rust and red spider; jujube fruit disease can kill 400 times liquid or king copper 400~500 times liquid; jujube anthracnose can be used anthrax fumei 500~600 times liquid prevention; jujube fruit disease can be used for agricultural streptomycin 100~140 IU/ml or agricultural oxytetracycline 200 IU/ml. Jujube pest red spider can be selected with Qiling 2000 times liquid or fenpropathrin 2000 times liquid, avermectin 4000 ~ 5000 times liquid control; the heartworm, jujube armyworm and other lepidopteran pests can be used 800 times Liquid control. Adding a spreading agent to the medicament, such as monomethylhydrazine hydrochloride, cellulose, soy milk, etc., can effectively improve the control effect.
For the varieties with heavy weights such as golden silk jujube, spray 30 μg/ml Zaofengling No. 2 in the first half of August, spray 20 μg/ml Zaofengling No. 2 in the next ten days or use naphthaleneacetic acid in August. 15 micrograms/ml on the 10th, 20 micrograms/ml after 7-10 days, and 15 micrograms/ml in the first ten days of September, the effect of preventing fruit drop before harvest is significant.
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