Strawberries gradually enter the dormant period after winter. Due to the shallow root system of strawberry, it can only tolerate a low temperature of -8°C and a temperature of -10°C for a short period of time in winter. If the temperature drops again, freezing damage will occur, and the plant will die in severe cases, which will reduce economic benefits. Therefore, it is necessary to take measures to prevent the strawberries from overwintering. In the north, cover and heat preservation are used to prevent cold and moisture, which is conducive to the growth of strawberries. However, if the mulching effect is not good, it will show late budding, weak growth, and significantly lower yield.
1. Coverage time. Every early winter, when the strawberry undergoes several frost and low temperature exercises, it is most suitable to cover the soil before the temperature drops to -7℃. It is generally mastered in November. Pour antifreeze water once before covering the cold material, and be sure to fill it thoroughly. Cover the ground one week after irrigation.
2. Covering materials. It can be used for crop stalks, leaves, soft grass, decomposed horse manure, finely broken ring loam, etc. If you use soil to cover the cold, you should first cover a small amount of grass and then cover the soil to avoid damage to strawberry seedlings when the soil is removed in spring. The thickness of the covering is determined by the local weather conditions and the insulation performance of the covering material, and the thickness is generally 3 to 5 cm.
3. Covering method. The covering is carried out in two times. After pouring the frozen water, it is a little dry, and a part of the material is covered first. After a few days, the temperature does not rise again and then the whole is covered.
4. Set up wind barriers to prevent cold. In densely planted strawberry gardens with stable snow, wind barriers can be erected to prevent the cold without ground cover. Wind barriers are set every 10-15 meters, and materials such as sorghum stalks, corn stalks, and reed mats can be used. The barrier is 2 to 2.5 meters high. If conditions permit, use materials such as cold-proof cloth and color steel tiles to set up wind barriers around the garden, and the effect is also very good.
5. Period of removing the cover. Generally, it will be carried out twice in the following spring after the beginning of thawing. For the first time, when the average temperature is higher than 0℃, remove the thawed cover. In the case of excessive rain and snow in winter, it must be removed in time to promote the thawing of the lower layer, which is conducive to sunlight and raises the ground temperature. The second time is when the strawberry is about to germinate. Do not remove the cold protection too late to avoid damage to the new stem.
Sixth, use mulching film to cover. After pouring the frozen water on the strawberry with mulch film, cover it according to the direction of the border when the surface is slightly dry and flattened. Tighten the mulch film when mulching, spread it flat so that the mulch film is close to the border surface, press tightly around the film, and cover the middle with a small mound to prevent the wind from blowing through the film, and then cover it. Or in areas with snow, it is better to cover strawberries with 10 cm thick wheat straw, thatch, straw and other materials and then cover with plastic film than to cover with mulch and then with mulch.
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