How to manage jujube trees?

How to manage jujube trees? Please give guidance to jujube management can refer to the following methods: first, jujube fruit setting, and "flower" has a direct relationship. The management of necessary measures before and during flowering of jujube can effectively improve the fruit setting rate and yield of jujube. 1. Topdressing at flowering stage. From late April to early May, each jujube tree was poured with 0.4 ml urea, 1.5 ml calcium superphosphate and 0.6 kg potassium chloride after mixing with water. Each jujube tree can also be poured with mature human feces and urine 10ml 15kg, plant ash 4ml 6kg, mixed with water. 2. Control insects before flowering. The overwintering pupae of jujube inchworm were dug up in March, and the poison ring of grass rope was used to control the adults of jujube inchworm and jujube flying elephant. 3000 times of pyrethroid pesticides were sprayed once in mid-late April and late May respectively. 3. Pick the heart before flowering. For jujube heads without backbone branches before flowering, when 5 permanent secondary branches appeared on the backbone branches, 4 or 3 secondary branches were left to pick the heart according to their growth strength. Because the jujube head appears sooner or later, so picking the heart should be carried out in stages. 4. Girdling at flowering stage. Girdling at full flowering stage can temporarily interrupt the downward transport of nutrients produced by leaves, so as to meet the needs of flowering and fruit setting and early development of young fruits. The specific method is to cut twice on the trunk 10mil 20cm high from the ground, the incision is 3mm wide and 5mm deep, and the phloem is removed. It is required to peel the mouth without residual skin and stubble to facilitate healing. After that, it will be carried out upward at an interval of 3m / 5cm every year, and then peeled back at the main branch branch. Girdling should be suitable for trees, but not for young and weak trees. Apply medicine to prevent insects after ring peeling, and wrap it strictly with paper or plastic film to prevent moisture from evaporating. 5. Release bees at flowering stage. According to the survey, putting bees in the jujube orchard during the flowering period can increase the fruit setting rate by about twice, increase the yield by 20%, and the nearer the beehive to the jujube tree, the higher the fruit setting rate. 6. Three sprays at flowering stage. One is to spray water. When the air relative humidity of the jujube tree is less than 60% during the flowering period, spray water evenly on the jujube flower with a sprayer, spray once every 6 days, and spray 3 times successively; second, spray fertilizer. In the early flowering stage and young fruit stage, 0.5% urea and 0.3% potassium dihydrogen phosphate solution can be sprayed on the leaves. Fertilizer spraying should be carried out in windless and cloudy weather, or in the morning and evening. The amount of fertilizer spraying is based on the wetness of the leaf surface. The third is to spray hormones. In full bloom, 10-15PPm is sprayed on strong trees with sodium naphthalene acetate, or 5-10PPm is sprayed with 2meme 4mi D. Using 30-60PPm 's naphthylacetic acid or 30PPm's 2mem4murD twice in young fruit stage (20 days apart) can effectively prevent its flower and fruit from falling. Spraying 0.2Mel 0.3% borax or boric acid at flowering stage can also effectively increase fruit setting rate. Second, summer pruning of jujube trees is also important. The summer pruning of jujube trees is mostly carried out from May to July. The main purpose of summer pruning is to restrain the excessive growth of jujube head, reduce the useless nutrient consumption, adjust the flow direction of nutrition, improve the light condition, increase the fruit setting rate, promote the fruit development, and improve the yield and quality. 1. Wipe sprouts. For the newly germinated jujube with no use value, it should be erased from the base as soon as possible to save nutrients and facilitate ventilation and light transmission. 2. Pick the heart. After sprouting and spreading leaves to June, the first branch, secondary branch and jujube hanging of jujube can be heart-picked to prevent its lengthening and growth, which is beneficial to the fruiting of the same year and the cultivation of robust fruiting branches. The degree of picking the heart of the first branch of the jujube depends on the space and growth of the jujube head. In general, the weak branches are heavy to pick the heart (leaving 2 Mel 4 secondary branches), and the strong branches are gently picking off the heart (4 Mui 7 secondary branches). For short dense jujube orchard, secondary branches and jujube hanging can also be coring. The heart should be picked moderately, although there were many fruits in the same year, but the area of the influence fruit increased, and a large number of jujube heads germinated on the secondary branches in the next year. When it was too light, the fruit setting rate decreased, the quality was poor, and the branch group was weak. 3. Pull branches. It is generally carried out from May to July, so that the branches are evenly distributed and the canopy is well ventilated and transparent. Click to get more jujube planting techniques click to get more fruit planting techniques