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 farmers: After the walnut trees fall (usually from mid-November to early December), measures against cold can be taken. First, the 1-2 year-old saplings that can not be safely overwhelmed by burying the soil against cold can bend the whole tree to one side and cover the soil. This method is the most effective and most reliable measure for preventing and controlling pumping. Second, soil protection against cold In the base of seedlings 30 centimeters to cultivate a mound in order to prevent frostbite roots and marry the 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. Third, the whitening of the cold-resistant sapling of the white sapling can ease the temperature difference between the yin and yang surface of the trunk, and the cold-proof effect is better. It can be applied before the soil is frozen. The formulation of the whitening agent is: 0.5 kg of salt, 6 kg of quick lime, 15 kg of clear water, and then add appropriate amount of adhesive and lime sulfur residue to spread over the young branches. 4. Polyvinyl alcohol is dried and evenly coated with the polyvinyl alcohol that has been prepared with tanning. The tanning method for polyvinyl alcohol is generally tanning using 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. 3 Layers Earloop Disposable Face Mask Bacteria Protection Face Mask,3 Ply Breathable Face Masks,3D Stereo Face Mask,3 Layers Earloop Disposable Face Mask Dongguan Keyutai Mask Co., Ltd. , https://www.maskkytai.com