In winter, the temperature in the north is relatively low, so it is necessary to bury soil to survive the winter.The first 10 days of burying soil should be irrigated with freezing water once, which can not only prevent root frostbite, but also avoid drought in early spring.At this time, watering should be thorough and sufficient to saturate the soil.When the soil is slightly dry, cover it with soil.
Soil burying shall be carried out in two stages.The first time is when the temperature lasts for two degrees, the pruned branches and tendrils should be tied up and covered with a layer of soil.Pay attention to the soil is not too thick, do not show branches and tendrils on the line.After cooling in late autumn, it is necessary to prune it to avoid a large amount of evaporation of water from branches and tendrils, which is not conducive to germination and growth next year.
When the temperature is continuously at zero degree, the soil should be buried for the second time, at this time, the thickness of the buried soil should be increased, and a proper amount of hay or corn straw should be prepared to cover the root system, which can increase the temperature and avoid the root system from freezing.Pay attention to digging away from the root system as far as possible.The width of the buried soil is about 1.8-2 meters, and the thickness is more than 60 centimeters.
Two methods are often used when burying soil. One is the method of burying soil on the ground.The pruned plants are directly depressed to fall on the ground and then covered with soil.The specific thickness of the soil depends on the temperature, the lower the temperature, the thicker the soil covered.The second is the underground burial method.The method of extending along the branches and tendrils is to dig ditches with a depth of 30-50 centimeters, then press the branches and tendrils in the ditches and cover the ditches with soil, which is more suitable for plants with many branches.
