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First, enhance the tree vigor and improve its frost resistance
1. Reasonable water control. Rainy years pay attention to drainage, so that the development of branches full and full, control watering late in the growth period, once before pouring water permeable.
2. Scientific fertilization. Adhering to the principle of “pre-promoting and post-controlâ€, in the later stages of growth, less nitrogen fertilizer should be applied, and more phosphorus and potassium fertilizers should be applied. Foliar fertilizers such as rare earth and potassium dihydrogen phosphate should be sprayed on the leaves to ensure that the tree body is robust and full, and antifreeze capability is improved.
3. Disease prevention and control. Dry rot mainly damages the trunk of the tree trunk, which makes the transportation of tree nutrients severely impeded; early leaves fall off the leaves early and the nutrition accumulation is poor, resulting in extreme lack of tree nutrients. Therefore, the timely prevention of dry rot and early defoliation, and the protection of branches and leaves are important measures to prevent the occurrence of freezing injury.
4. Winter cut ahead. Winter pruning can be performed in late November and early December to prevent shoots from drying out to facilitate wound healing. For pruning wounds, protectors should be applied.
Second, strengthen protection and avoid freezing damage
1. Spray protection. Spray Bordeaux fluid before winter arrives to prevent the occurrence of diseases.
2. The trunk is painted white. Before the winter, the trunk was painted white in combination with the clear garden.
3. Smoke smoke rises. In the early spring, the use of corn stalks (to be crushed), sawdust, and other smoke in the garden heat up antifreeze, usually 3 to 4 fires per acre can be heated 3 °C ~ 4 °C. Be careful not to ignite. If the material is too dry, spray water properly to take the smoke.
4. Plastic film package. Young trees that are susceptible to freezing can be wrapped in plastic wrap. Pomegranate tree more needles, easy to break through the film, should first pack grass, outsourcing plastic film.
5. Neck and soil. Before the soil is frozen, combine the cultivator on the roots of the tree roots to cultivate soil and the thickness is 20-40 cm. Before spring sprouting, choose the right timing to remove.
Prevention of freezing injury of pomegranate young trees from the autumn
Last year, the annual frost-free rate of annual two-year rooted pomegranate seedlings planted around Hengshui Lake was as high as 100%. The reason is that the temperature in winter last year was high and precipitation was less. Under such conditions, once it is caught in the early winter cold, frost, late spring, and then sparsely protected, it is prone to frost damage. In addition, the occurrence of frost damage is related to the humidity in the field, soil moisture, tree vigor, seedling varieties, and breeding methods. In general, seedlings are light, followed by root and seedlings, and cuttings are heavy. Tree-age 1 to 2 years old trees have the worst frost resistance. The prevention of freezing injury of pomegranate young trees should start from the autumn.