If the temperature is too low, the grapes will be frozen to death. Five measures to protect grapes from winter.

Grapes overwintering in buried soil

First, master the cold resistance of grapevines. The grapevine frozen in winter is mainly in the root, followed by the stem, branch and stem. Different degrees of freezing injury will occur when the ground temperature of grape roots drops to minus 6 ℃, and when it drops to minus 8 ℃, all grape roots freeze to death. Therefore, the root temperature of grape should be kept above minus 6 ℃ in winter.

Second, timely irrigate frozen water. Ten days before burying cold-proof soil in winter, cold-proof water should be irrigated once to prevent grape root frost damage and early spring drought. When irrigating, it must be fully irrigated to the extent that the soil is saturated. When the soil on the ground is slightly dry, bury the soil to prevent the cold.

Third, get off the shelves in time and bury the cold-proof soil for the first time. In early winter, not only the temperature is low, but also the wind is strong, and the water content of grape stems and branches is easy to evaporate because of the wind. After the grapes have fallen leaves, prune them in time, and then tie up the branches with grass ropes. When the temperature is stable at about 2 ℃ for five consecutive days, the cold-proof soil should be buried. Do not bury too much soil for the first time, as long as the branches are not exposed.

Fourth, bury the second cold-proof soil at the right time. It is better to bury the second cold-proof soil when the temperature drops to 0 ℃, that is, to bury the second cold-proof soil before freezing. In winter, the ground temperature at the 80cm below the surface drops to minus 2 ℃, and the thickness of the cold-proof soil is 20-30cm. When the soil temperature drops by 1 ℃, the thickness of the buried soil adds 10cm. As long as it is done according to this law, there will be no frost damage. In order to achieve a better cold-proof effect, when burying the second cold-proof soil, corn straw or grass should be covered first. This can significantly increase the temperature at the root of the grape. The width of the cold-proof soil (bottom width) should not be less than 1.2m. After burying it, use a spade to pat slightly. In addition, the thickness of cold-proof soil is also related to the local soil quality.

Fifth, pick up the site and seal the trench. When digging cold soil, the soil must be taken as far as possible from both sides of the trunk of the vine, not too close to the root, so as to avoid cold air from the soil ditch to invade the root of the vine, causing frost damage. If there are irrigation conditions, the soil ditch irrigation should be frozen into ice after freezing, which can not only prevent the invasion of cold air, reduce the thickness of permafrost, but also be beneficial to root overwintering and drought prevention in the following spring. If there is no irrigation condition, the soil ditch can also be covered with random grass and other things.