Attention should be paid to winter mulching of strawberries

Strawberries gradually enter the dormant period after late autumn. Strawberry has shallow roots and can withstand the low temperature of-8 ℃ and the air temperature of-10 ℃ in a short time. If the temperature drops again, frost injury will occur. In serious cases, the plant will die, resulting in a decline in economic benefits. The overwintering cold prevention measures of strawberries cultivated in the north are mainly mulching. Overwintering covers against cold and preserves moisture, which is conducive to the growth of strawberries. Strawberries that were not carefully covered with cold protection showed late germination, weak growth and a significant decrease in yield.

Covering time in early winter every year when strawberries are tempered by several frosts and the temperature drops to-7 ℃, mulching is the most suitable when the soil is frozen during the day and night. It is generally controlled during November. Second, the coverage method 1. Cover time. Before covering the cold-proof material, the strawberries should be filled with anti-freezing water. Irrigation time will be carried out when the soil is about to enter the freezing period, and the ground will be covered one week after irrigation. two。 Covering material. Can use all kinds of crop straw, leaves, soft grass, rotten horse dung, fine circle fertile soil and so on. If you use soil to cover against the cold, it is best to cover a small amount of grass first, and then cover the soil, so as not to damage strawberries when removing the soil in spring. 3. Overlay thickness. Depending on the local climatic conditions and the thermal insulation performance of the covering material, the general thickness is 3 to 5 centimeters and 200 to 300 kilograms per mu of grass. 4. Override method. Cover had better be divided into two stages, after pouring frozen water, a little dry, first cover part of the material, after a few days, when the temperature no longer rises, and then all cover strictly. 5. Set up wind barriers to protect against the cold. In closely planted strawberry orchards with stable snow cover, wind barriers can be erected to protect against cold without ground cover. The wind barrier is set up every 10 to 15 meters, which can be made of sorghum stalk, corn straw, Reed mat and other materials. The height of the barrier is 2 to 2.5 meters. Conditional use of cold-proof cloth, colored steel tiles and other materials around the garden to set up wind barriers, the effect is also very good. 6. The period of removal of the mulch. It is usually carried out in two stages after thawing in the spring of the following year. For the first time, the thawed mulch was removed when the average temperature was higher than 0 ℃. In the case of too much rain and snow in winter, it should be removed in time to promote the thawing of the lower layer, which is conducive to sunlight and improve the ground temperature. The second time when the strawberry is about to sprout, do not remove the cold protection too late, so as not to damage the new stem. 7. Covered with plastic film. Use 0.008mm-0.015mm thick polyethylene transparent mulch. After the strawberries are covered with frozen water, wait for the surface to dry, flatten the border, and then cover the plastic film according to the direction of the border. When covering the film, it is necessary to tighten the plastic film and lay it flat, so that the plastic film and the border surface are tightly pressed around the film, and then covered with a small mound in the middle to prevent the wind from blowing through the film, and then cover the mulch. Or in areas with snow, strawberries are directly covered with 10 cm thick wheat straw, thatch, straw and other materials and then covered with plastic film, which is better than covering plastic film first and then covering the mulch. Matters needing attention 1. The time of coverage should not be too early or too late. If the temperature is high prematurely, it is easy to cause rotten seedlings; freezing injury will occur after the party. two。 When overwintering, it is necessary to pour through frozen water, which is conducive to preventing cold and preserving moisture. 3. Cover materials try not to choose weeds with seeds, so as not to bring grass shortage. 4. After all the mulch is removed, after the ground is slightly dry, a cleaning is carried out to remove withered stems, rotten leaves and residues, so as to reduce the occurrence of diseases and insect pests. 5. When plastic film mulching is used, due to the advance of florescence after mulching, it is easy to be affected by frost in the areas with late frost, so it is necessary to pay attention to strengthen protection.