Cold protection technology of walnut trees growing walnut
Due to the large core of walnut branches, high water content and poor cold resistance, walnut branches are easy to suffer frost damage in cold and arid areas in the north, resulting in branches drying up. Therefore, in order to ensure the normal growth of young trees and prevent frost injury, the work of cold prevention in winter should be strengthened to reduce the harm. Here are several cold prevention measures for fruit growers' reference:
Cold prevention measures can be taken after walnut trees have fallen leaves (usually from mid-November to early December).
The main results are as follows: 1. Burying the soil to prevent cold is the most effective and reliable measure to prevent strips from bending the whole tree body to one side and covering the soil for the 1-2-year-old young trees which can not survive the winter safely in the open field.
2. Cultivate soil to prevent cold and cultivate a mound within 30 centimeters of the base of the seedling to prevent frostbite on the root neck and the graft interface. Remove the tree plate after the temperature picks up and stabilizes in the coming spring.
3. The white coating of young trees can alleviate the temperature difference between the yin and yang of the trunk, and the anti-cold effect is better, which can be applied before the soil is frozen. The formula of whitening agent is: 0.5 kg of salt, 6 kg of quicklime, 15 kg of water, and then add an appropriate amount of adhesive and stone sulfur agent residue all over the branches of young trees.
4. Polyvinyl alcohol (PVA) is used to evenly brush the trunk of seedlings with boiled PVA. The boil method of polyvinyl alcohol is: generally adopt the ratio of "polyvinyl alcohol: water = 1:15-20". First boil the water to about 50 ℃, then add polyvinyl alcohol (do not wait for the water to boil before adding, otherwise polyvinyl alcohol can not be completely dissolved, the solution is uneven), stir with the addition until it boils, and then simmer for 20-30 minutes. Use when the temperature drops to the point where the hand is not hot.
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