First, master the cold resistance of vines. Winter damage to the vines is mainly at their roots, followed by the stems and branches. When the ground temperature at the grape roots drops to minus 6°C, different degrees of frost damage will occur; when it falls to minus 8°C, it will all freeze to death. Therefore, the temperature of the roots of grapes should be kept below -6°C during the winter.
Second, timely irrigation frozen water. In the first 10 days of burying cold soil in winter, cold water should be irrigated once, in order to prevent frost damage in the root system and drought in early spring. When filling the water, it is necessary to fill enough water to reach the saturation state. When the soil on the ground is a little dry, cover it with cold.
Third, timely off the shelf and buried the first cold-proof soil. In the early winter, not only the temperature is low, but also the wind power is large. The water content of grape stems is easily evaporated by the wind. After the grapes are defoliated, they should be trimmed in time, then tied with straw ropes, etc., and when the temperature is stable at about 2°C for five consecutive days, the cold soil should be buried. Do not overfill the first time, so as not to expose the dendrite.
Fourth, bury the second time to prevent cold soil. The second time of burying the cold-proof soil is better when the temperature drops to 0°C, that is, burying the second cold-proof soil before freezing. In areas where the temperature below 80 cm below the surface of the earth falls below -2°C, the thickness of the cold-proof soil is 20 cm to 30 cm. When the soil temperature is reduced by 1°C, the thickness of buried soil is increased by 10 cm. As long as this law is followed, it is not Cold damage can occur. In order to achieve a better cold-resistance effect, it is necessary to cover corn stalks or grass when burying the second cold-proof soil. This can significantly increase the temperature of the grape roots. The width (bottom width) of the cold-proof soil should not be less than 1.2 meters. In addition, the thickness of cold soil is also related to the local soil quality.
Fifth, take the land and back to fetch ditch. When digging against cold soil, it is necessary to take the soil as far away from both sides of the trunk of the vine as possible, not to be too close to the roots, so as to prevent the cold air from invading the base of the grapevine from the trench and causing freezing damage. Where there are irrigation conditions, the fetching pit should be frozen and frozen into ice after being frozen. This will not only prevent the intrusion of cold air and reduce the thickness of the frozen soil layer, but also help the roots to overwinter and late spring to prevent drought. Where there is no irrigation condition, mud ditch can also be used to cover the ditch.
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