In recent years, due to the abnormal climate, sweet cherry winter freeze injury occurs from time to time. Sweet cherry is not tolerant to cold, when winter falls to -20°C, flower buds and branches suffer freezing injury. Below -25°C, it will cause tree death; therefore, the focus of winter sweet cherry management is wintering of trees and prevention of cold. Overwintering pests and diseases provide guarantees for the safe wintering of trees and the growth of tree growth and yield in the following year.
1, deciduous root top dressing
The top-dressing fertilizer has the advantages of being simple and easy to use, using less fertilizer, and having a quick effect. According to studies, before leaves fall off, 50% to 75% of the nitrogen is returned to the tree body; spraying the 0.8% to 1% urea on the leaves of the tree body 2 weeks before the defoliation can accelerate the return of nutrients in the leaves and increase the number of trees. Storage nutrition level, thus enhancing the flower bud, tree's ability to freeze resistance.
2, branches painted white
Whitening the trunk can reduce the tree damage that occurs in sweet cherry due to freezing and freezing injury in winter, and can cover the wound and prevent the invasion of bacteria. Coated white is usually carried out in the late autumn after the deciduous trees. Before the application of white, the old skin is scraped off. The base of the main body and base of the lower part of the tree less than 1m is painted white by 0.3m, especially for the branches. The whitening agent used 8 to 10 parts of lime, 1 part of lime sulfur cocktail, 1 part of salt and 20 parts of water, and a small amount of animal oil vegetable oil. When disposing, use a small amount of water to separate the salt and calcined lime, add the lime sulfur mixture, and stir the oil. Whitening can not only prevent frost but also effectively control pests and diseases.
3, pouring frozen water
If the autumn is dry, before the end of November and early December, when the soil is “frozen in the night,†the apple orchard is once filled with frozen water and the root soil is poured. Reduce soil drought, release heat when water freezes, thereby increasing winter low temperatures, keeping the soil temperature relatively stable, reducing the occurrence of freezing damage, and preventing spring drawing.
4, Qingyuan deep turning
Before freezing, the pupae or adult pests of overwintering insect pests, etc., are exposed on the surface by deep-turning the tree plates, and they are killed by using low temperature in winter. After falling leaves, we must promptly remove fallen leaves and weeds, cut off pests and branches, and remove them outside the park for deep burial or burning.
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