1. Different degrees of frost damage in different geographical conditions. The fertile plains are lightly affected by freezing, and the thin mountainous areas, tuyote areas and sandy lands are seriously affected by freezing. 2. Different varieties have different degrees of frost damage. Early-maturing chestnut 313 was seriously affected by freezing, followed by short stab, and the late-maturing variety Beibei No. 2 and Dongling Pearl were lightly chilled. 3. The age of growth is different and the extent of frost damage is different. Newly grafted 1-year-old chestnuts are almost completely destroyed. Chestnuts from 2 to 3 years old suffer from freezing damage more than perennial chestnuts. Perennial chestnuts are mostly affected by freezing, and the resulting chestnuts have more heads. 4. The tree vigor differs in the degree of frost damage. The weakest of the trees suffers from freezing damage, and the strong trees suffer from freezing damage. Second, the cold winter technical measures 1. Juvenile stem base soil. For 1 to 3 year old saplings, it is easy to get rid of the trunk by cold-proofing the saplings. Therefore, a cone-shaped mound with a height of 50 cm can be cultivated at the base of the trunk to prevent cold. 2. The trees are white or wrapped. After the whitening time is defoliated in the fruit trees, the ratio of raw materials is: quicklime, lime sulfur, salt, and water are prepared at a ratio of 6:1:1:20. During the preparation, the lime is opened, the oil is poured into the well-stirred water, and then the water is mixed into lime milk. Finally, lime sulfur and salt water are added, and an adhesive can be added. This whitening agent can be used to coat white trunks and spray white trunks. The role of quicklime is to whiten and reduce the temperature difference; lime sulfur has both the role of disease prevention, which is equivalent to spraying 1 Baume degree of lime sulfur; salt and oil are mainly water retention. Before the spring sprout, it would be better to spray lime sulfur again. Second, wrapping plastic sheets, newspapers, etc. can also play a role in cold. Root thick organic fertilizer (or straw, weeds). The thick organic fertilizer on the top of the tree plate, the organic fertilizer in the fermentation process, can generate heat to increase the temperature, protect the roots safe winter. In the sand land, it should be thicker. 4. Robust tree body. Fertilizing soil fertility and increasing organic manure can increase soil organic matter content, rejuvenate tree vigor, and increase tree resistance. General Mushi organic fertilizer 5000 kilograms. 5 flower buds sprouting period spray more love. The sprouting period of flower buds is the time when the spring cold wave is approaching. Spraying more and more at this stage can increase the cold resistance of flower buds. Before and after the flowers, the spray of 5,000 times more love. 6. Select suitable cold resistant varieties in suitable places. Don't plant chestnuts on tuyere and sandy lands; chestnuts on inhospitable mountainous regions should be made of robust trees and organic fertilizers should be applied more. Secondly, it is necessary to choose more suitable cold resistant varieties.
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The Causes of Cold Damage to Chestnut Trees and Countermeasures
First, the cause of frost damage