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Zaoyuan Summer Management
First, the topdressing topdressing tree is generally chased twice, that is, after the flowering fertilizer and young fruit fertilizer. The purpose of flowering is to promote the growth of new shoots and young fruit and increase the fruit setting rate. More nitrogen fertilizer should be applied. Generally, about 0.5 kilograms of urea are applied before the flowering of jujube trees. The purpose of young fruit fertilizer is to promote the rapid expansion and increase of fruits. In order to improve the quality and sugar content, more phosphorus and potassium fertilizers should be applied. In the young fruit period, each compound fertilizer should be topped with about 1 kg of compound fertilizer. In addition to good foliar fertilizer, that is, before flowering and young fruit spray 0.5% urea and 0.3% potassium dihydrogen phosphate solution, flowering spray 0.3% borax solution, can significantly improve the fruit setting rate. Second, watering jujube trees require sufficient water in the early growth period, especially the flowering period and young fruit period can not be short of water, according to the weather conditions, pouring water twice. Watering at the flowering stage can increase the air humidity, which is conducive to pollination and fertilization and increase the fruit setting rate. Watering young fruit can prevent fruit from falling and promote the growth and development of young fruit. Third, the summer pruning, circumcision can reduce flowering and fruit drop, increase fruit set rate, promote fruit hypertrophy, improve fruit quality, improve fruit ripening. More than ten years in general, the canopy is basically formed before it can be peeled off. Early circumcision will inhibit the further expansion of the crown or the phenomenon of premature aging. The girdling time is appropriate for the early stage of flowering and should be conducted every other year. The specific method is: the first time in the trunk 30 cm above the ground, first scrape off the old skin of the trunk, a width of about 1 cm, and then girdling, girdling should master "Zhuangshu heavy peeling, weak tree light Stripping principle, Zhuangshu general ringing mouth width is 0.6-0.7 cm, weak tree is 0.3-0.4 cm, after another year in the 3-5 cm away from the last circumcision place, then girdling, followed by the trunk gradually Step up. For the trees that are too weak, they are no longer gimmicked and will be resumed after the tree potential is restored. Note that circumcision should be carried out on a sunny day, and the width of the ring should be narrow and narrow. After a week of peeling, the pesticide should be coated with a plastic film. The girdling must be combined with enhanced water and fertilizer management, otherwise the growth of the tree will be affected. 2. Sparse branches and erect leggy branches shall be removed immediately before thinning and flowering, and the weak hanging and hanging shall be neglected during the circumcision period. 3, topping, wiping buds can improve the nutritional level of shoots, ease the contradiction between the growth and results of new shoots, increase production effect is obvious, the cutting tip is generally carried out in the flowering period, the spring sent by the jujube head left 3-5 second branches short cut For the second branch, we must also take care of it. When the fruit enters the young fruit stage, it will hit the tip and useless buds germinate on the branches of various levels, and the buds will be wiped to save nutrition, improve light, and increase fruit setting rate. IV. Prevention of Diseases and Insect Pests During flowering to fruit enlargement period, pest and disease prevention should be emphasized. 15% triadimefon wettable powder 1000 times solution is used to prevent and control jujube rust. The mixture is sprayed with 80% dichlorvos 1000 times and 40% phoxim 1000 times to prevent and cure jujube. Tai Chi, armyworm, peach, small borer and so on.