Introduce a few walnut trees a good way to prevent the cold

Due to the large pith heart, high water content, and poor cold resistance, walnut branches tend to suffer freezing injury in areas that are cold and arid in the north, causing dried branches. Therefore, in order to ensure the normal growth of young trees and prevent freezing damage, winter cold work should be strengthened to reduce the harm. Here are some examples of cold-proof measures for fruit growers: After walnut trees are defoliated (usually from mid-November to early December), measures against cold can be taken. 1. The 1 to 2 year old saplings that can not be safely overwhelmed by burying the ground against cold can bend the whole tree to one side and cover the soil. This method is the most effective and reliable measure to prevent and control pumping. 2, cultivate soil in the seedlings base 30 centimeters in the training of a soil mound, to prevent frostbite neck and graft interface. After the spring temperature has risen and stabilized in the spring of next year, it will be removed and the tree plate will be leveled. 3, white coated anti-cold sapling white can ease the temperature difference between the surface of the yin and yang trunk, cold effect is better, can be applied before soil freezing. The formulation of the whitening agent is: salt 0.5 kg, quicklime 6 kg, clean water 15 kg, and then add the appropriate amount of adhesive and lime sulfur residue coated over the young branches. 4. Polyvinyl alcohol should be dried and evenly painted with a retort of polyvinyl alcohol. The tanning method for polyvinyl alcohol is: generally, a tanning method is employed at a ratio of "polyvinyl alcohol:water=1:15-20". Heat the water to about 50°C, then add polyvinyl alcohol (cannot wait for the water to boil and then add, otherwise the polyvinyl alcohol can not be completely dissolved, the solution is not uniform), with stirring and stirring, until boiling, and then use slow fire After 20-30 minutes. Wait until the temperature drops until it is hot.

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