The temperature drops suddenly. How to prevent strawberries from freezing?

The optimum temperature of strawberry fruit is 20~25℃ during the day and 6~8℃ at night. Low temperature at night is beneficial to the accumulation of nutrients and promotes fruit hypertrophy. During the day, the room temperature should also be raised appropriately, and the temperature index of the external insulation cover in the afternoon should be 2 ~ 3℃ higher than that before the cold wave strikes. In order to enhance the stress resistance of plants, the green bag fertilizer Chinese medicine gene peptide was sprayed on the leaves before and after low temperature, diluted with selenium-enriched nutrient solution 1: 100 times, and sprayed continuously for 2~3 times. It can adjust the physiological function of strawberry, promote the absorption of other elements, enhance metabolism, increase the cold resistance of crops, improve the resistance of strawberry plants to low temperature stress, promote growth recovery, and cooperate with spraying pests and diseases. It is forbidden to water in the low temperature period before and after the cold wave strikes, so as not to reduce the ground temperature and aggravate the cold damage and freezing damage. After the weather gets warmer, normal water management will be resumed.

After strawberry planting, the whole growth period not only faces low temperature freezing injury, but also faces threats such as diseases. Therefore, improving the frost resistance and disease resistance of strawberries is very important for the smooth growth process, high fruit yield and good quality of strawberries. Before the cold wave comes, foliar spraying or root irrigation with liquid trace elements of fulvic acid from Ching Tien Mine can improve strawberry's ability of disease resistance, cold resistance, drought resistance and continuous cropping, increase soil aggregate structure, degrade soil heavy metal pollution, promote root growth, take root and strengthen seedlings, improve photosynthetic efficiency of strawberry leaves, increase photosynthetic products of strawberry plants, and achieve the effects of increasing yield, improving quality, cold resistance and disease prevention. The specific heat capacity of water is relatively large. When the moisture content of strawberry suddenly rises, it can play a role in avoiding the low temperature drop, thus avoiding the root freeze injury of strawberry. It can also promote the steady rise of temperature in sunny days and gradually restore the frozen tissue function of plants.

When farmers are watering to keep warm, they must pay attention to watering at noon on sunny days, and watering at night on cloudy days will only aggravate the freezing damage of crops. Cover the greenhouse inside and outside with a straw curtain. In extreme weather conditions such as rain and snow, it is best to cover the surface of the grass curtain with an old shed film to keep warm and prevent the grass curtain from being soaked by rain and snow. Water has a large heat capacity. Even if the cold current invades, the temperature drops sharply and the water in the greenhouse freezes, it will release a lot of heat. Therefore, the temperature in the greenhouse will not drop too much, which can increase the temperature of soil and air in the greenhouse and ensure the normal growth of strawberries in the greenhouse.