The newly planted walnut trees are prone to young shoots drying out in winter. This is due to the fact that walnut tree branches have a large pith, high water content, and poor cold resistance. After investigation and study, a management method for the protection of the young trees of walnut trees was developed. That is, after the deciduous walnut trees (generally from mid-November to early December), cold protection management began.
The specific method is:
1. Buried in cold weather: For 1-2 year old saplings that cannot be safely overwintered on exposed grounds, place walnut seedlings at 15-20 centimeters, and then cover them with soil. Scrape the soil before sprouting the next year. This method is the most effective and reliable measure for preventing and controlling pumping.
2. Soil protection against cold: In the base of the seedlings, a soil pile is cultivated within a range of 30 cm to prevent frostbite and grafting. In the spring of next year, after the temperature echo, remove and level the tree disk.
3. Anti-cold whitening: The sapling whitening can relieve the temperature difference between the yin and yang of the trunk, prevent the main branch and the trunk from freezing damage and daily burning. It can be painted white and have a good effect on cold and can be applied before the soil is frozen. The formulation of the whitening agent is: The formulation of the whitening agent is: 40 parts of water, 10 parts of quicklime, 2 parts of lime sulfur, and 1 part of salt.
4. Packing grass to prevent cold: 1-3 years of saplings after planting grass cold. That is, in the winter, straw, sacks, woven bags, straw mats, etc. are used to wrap up the trunks and main branches, and then the two ends are tied, that is, windproof and cold-proof, so that the young walnut trees can survive the wintering period.
5. Polyvinyl alcohol coating: The seedlings shall be evenly painted with 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.
6. Irrigation and cold-proofing: Irrigation of walnut trees before freezing can not only play a role in preventing the spring drought in spring and promote the growth and development of walnut trees, but also use water to accumulate more calories. The ground temperature during the winter is relatively stable. Walnut trees freeze damage.
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