Breeding soil to prevent cold: Cultivate a mound of soil within 30 cm of the base of the seedling to prevent frostbite root neck and marry interface. In the spring of the next year, the temperature will rise and stabilize, then remove and level the tree. The 1-2 year old saplings that can not be safely overwintered in the open field will bend the whole tree to one side, cover the soil, spray new high-fat film insulation and protect the sputum. This method is the most effective and reliable measure for preventing and controlling the pumping. Whitening cold-proof saplings can alleviate the temperature difference between the yin and yang of the trunk. The formula of the whitening agent is: use the "tree guard general", mix 0.5 kg of salt, 6 kg of quicklime, 15 kg of clear water, and then add appropriate amount of adhesive and stone. The residue of the sulphur mixture is spread over the young branches. Apply before the soil is frozen, the cold protection effect is better.
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