Buried against the cold. For 1-2 year-old saplings that cannot be safely overwintered on the open land, leave 15-20 cm flattened walnut seedlings, then cover them with soil, and shovel the soil before sprouting the next year.
Soil protection against cold. A mound of soil is cultivated within a 30 cm radius of the base of the seedlings to prevent frostbite and grafting. In the spring of next year, when the temperature rises, it will be removed and the tree plate will be leveled.
White coated with cold. Sapling whitening can ease the temperature difference between the yin and yang surface of the trunk, prevent freezing and sunburn of the main branch and trunk, and have a better anti-cold effect with white coating. It can be applied before the soil is frozen. 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.
Package grass cold. The saplings of l-3 years after planting are protected against cold. In winter, straw, sacks, woven bags, etc. are used to wrap up the trunk and main branches, and then tied at both ends to prevent wind and cold, so that the young walnut trees can survive the wintering period.
Polyvinyl alcohol is dried. Use tanned polyvinyl alcohol to evenly coat the main seedlings. The water can be first heated to about 50 °C, then add polyvinyl alcohol, with the addition of stirring, until boiling, and then use the slow fire brewing 20-30 minutes. Wait until the temperature drops until it is hot.
Irrigation cold. Pre-frozen irrigation of walnut trees can play winter spring to prevent the spring drought, promote the growth and development of walnut trees, but also can use water to accumulate more calories, so that the ground temperature during the winter is relatively stable, reduce frost damage to walnut trees.
The best choice for Analog hearing aids with earbuds design
The best choice for Analog hearing aids with earbuds design
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