The branches and buds of the grapes are relatively cold-resistant, and mild frost damage occurs when the roots are at minus 4 degrees, and they can be frozen to death at minus 5 degrees to minus 7 degrees. Before and after the winter dew to the winter solstice, the grape after the fall cut should be placed in a ditch, covered with a straw bag at night, opened during the day, and poured with water before the frost falls. This period of time before freezing is in the dormant period, so it is necessary to prevent cold at the right time. Commonly used methods for cold prevention are as follows: 1. Use sand buried or buried in soil to prevent cold. The first step is to bundle the grape branches of winter cuts along the ditch, cover them with sand or soil for 20 centimeters or 30 centimeters, and then freeze them for 10 centimeters, then cover them with leaves and some grass for 50 centimeters. One meter is extended around, and several small straws are planted at the same time. The upper end is exposed and has air and light transmission. Second, hollow cold. In the ditch, bricks and adobe are used to form a trough, and the winter-cut twigs are tied in the middle. The top is covered with wooden poles, and the straw and grass bags are covered to cover 20-30 centimeters, and then covered with leaves or firewood. 50 centimeters, along the ground to leave a few vent holes, fill in at 0 degrees, to be opened the next year when the Qing Ming, to prevent heat and mildew. Third, plastic film cold. The bundles of winter cut twigs are bundled, placed in a ditch, covered with a plastic film, buried with soil around them, and then covered with leaves and firewood for more than 50 cm, leaving ventilation holes along the ground. Fourth, freezing cold. The first 3 methods can be used to cover the soil from 10 cm to 20 cm. From November to early December, when the temperature is minus 20 degrees Celsius, several times of water is poured to form a thick ice shell, which plays a role in preventing the cold. Covering the soil should be farther away from the roots of the grapes to avoid frostbite. In the second and fourth months of April, the first time leaves and weeds were removed. Ventilation with open vents prevents high ground temperatures, high humidity and mildew. Remove all covers before mid-May. China Agricultural Network Editor
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