Strawberry in open field should be frost-proof in spring
July 06 15:04:43, 2019
After sprouting in spring, the plants are short and sensitive to frost. At 1°C, the damage to the strawberry seedlings is lighter, and at -3°C, the damage will increase. After the young leaves of young strawberry are lightly frosted, the tip and the leaf margin will turn yellow. When the buds and open flowers that are growing are severely damaged by cold, they cannot develop fruit. When the damage is light, part of the pistil will be frozen and change color, and it will grow into a deformed fruit. In early spring, the strawberry flowering period is also a frequent occurrence of late frost in the cold regions of northern China. The following precautionary measures should be taken in time to prevent the unseasonable strawberry from being attacked and damaged during the growth period. First, pay attention to choose anti-frost varieties. When planting and growing strawberries, the early-maturing varieties should not be planted as much as possible, and priority should be given to selecting new strains resistant to frost and medium- and late-maturing varieties. Second, in early spring, according to the actual situation in the local area, it is appropriate to remove the coverings used in winter for cold weather. Especially in areas where late frost is prone to occur and where there are more occurrences, local conditions should be adopted to postpone or prolong the duration of overwintering cold weather coverings and mulching films according to climate change. Third, pay attention to weather forecast and abnormal weather changes. In the event of cold frost and cold current, temporary emergency cover can be made with straws, plastic film or other coverings. Fourth, spray irrigation frost. Where sprinkler conditions are available, sprinkler irrigation can also prevent frost damage. Fifth, smoke and frost protection. Using the method of igniting smoke, in the time when there is night frost, find some straw, rice hull, wheat straw, wheat bran, sawdust or dead branches, corn stalks, straw, fuel, night light, control invented It is advisable that the fire smoke only, so that the smoke is diffuse, covering the strawberry planting or growing area. Generally, 4 to 6 smoke-burning points can be set per acre, which can increase the ground temperature by 2°C to 3°C, which can effectively prevent the occurrence of frost disasters.
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