Buried soil protection against cold: For the 1 to 2 years young trees that cannot be safely overwintered in the open field, the whole tree is bent to one side and covered with soil. This method is the most effective and reliable measure to prevent drawing.
Cultivate soil to protect against cold: Cultivate a mound within 30 cm of the seedling base to prevent frost damage to rhizomes and grafts. Removed after the temperature rises and stabilizes in the following spring, leveling the tree.
White coating for cold protection: White coating for young trees can relieve the temperature difference between the yin and yang sides of the trunk, and the cold protection effect is better. It can be applied before the soil is frozen. The formula of the white coating agent is: 0.5 kg of table salt, 6 kg of quick lime, 15 kg of water, and then add the appropriate amount of adhesive and residue of stone sulfur mixture to spread the young branches.
Polyvinyl alcohol coating: Use boiled polyvinyl alcohol to evenly coat the seedling trunk. The cooking method generally adopts the ratio of "polyvinyl alcohol: water = 1:15 to 20" for cooking. First boil the water to about 50 ° C, then add polyvinyl alcohol (do not wait for the water to boil before adding, otherwise the polyvinyl alcohol cannot be completely dissolved and the solution is not uniform), stir as you add until it boils, and then cook with gentle heat After 20 minutes to 30 minutes, it can be used after the temperature has dropped to not being hot.
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