How to manage greenhouse strawberries in windy, snowy and foggy weather?

In protected cultivation of strawberries, severe weather such as strong winds, heavy snow and dense fog is often encountered in winter and spring. Although these weather conditions occur at a low frequency, once they occur, if measures are not taken in time, strawberry production will suffer serious losses. The management experience from production is now introduced to everyone:

Management on windy days If greenhouse strawberries encounter strong winds, the greenhouse film will bulge with the wind and flap up and down. If not managed in time, the greenhouse film will be blown open, causing the strawberries in the greenhouse to suffer freezing damage. Management measures: block all ventilation openings tightly to prevent strong winds from blowing into the greenhouse and harming strawberry plants and damaging the greenhouse film. Tighten the film-pressing lines, and if necessary, lower part of the straw mats to press the greenhouse film firmly. If strong winds occur at night, press the straw mats firmly; it is best to use woven bags half-filled with soil to press down part of the straw mats, to prevent the strong wind from blowing the straw mats off.

Management on snowy days When snow falls in early winter and early spring, the outside temperature is not very low, and the snow may melt as it falls, soaking the straw mats. This not only affects insulation and makes it difficult to roll and unroll the straw mats, but also easily crushes the greenhouse frame. Therefore, the method should be adopted of uncovering the straw mats before snowfall, clearing the snow after the snow stops, and then putting the straw mats back down. When blizzard weather occurs in deep winter, the outside temperature is too low to uncover the straw mats, otherwise the strawberries in the greenhouse will be frozen. Management measures: when heavy snow presses on the straw mats, it is very easy to crush the greenhouse frame, so the snow on the straw mats must be cleared in time, and the snow beside the greenhouse walls must also be cleared, to prevent the snow from melting and seeping into the greenhouse through the soil, which not only takes away heat but also damages the greenhouse walls. Sweep the snow off the greenhouse film during the day to enhance the light transmittance of the greenhouse body. Raise the greenhouse temperature, adopt temporary measures to reasonably regulate the greenhouse temperature, and pay attention to preventing gas damage. To increase temperature and prevent freezing, small arched tunnels can also be set up inside the greenhouse. Improve lighting; during the day, pay attention to uncovering the straw mats early, but be careful not to uncover them all at once, to prevent the light from being too strong after the snow clears and turning sunny, which would cause severe water loss in strawberries and permanent wilting.

Management on cloudy and foggy days Cloudy and foggy weather often occurs in winter. Under such weather, the light in the greenhouse is less than 1/5 of that on sunny days, the relative air humidity is above 95%, and the indoor temperature is below 15°C. Such severe weather not only limits the photosynthesis of strawberry leaves and reduces photosynthetic products and delays the strawberry ripening period; if cloudy and foggy weather continues for several days during the strawberry flowering period, it will also greatly reduce the fruit-setting rate of strawberries, produce deformed fruits, and lead to reduced yield and deteriorated quality. Management measures: First, increase artificial supplementary lighting. Incandescent lamps can be used as the light source for heating treatment, with each 100-watt lamp illuminating about 7.5 sq m, heating for 5 to 6 hours every day from 5 p.m. to 10 p.m.; strawberries can increase yield by 30% to 50%, and deformed fruits are reduced by 50%. Second, reasonably control temperature. Install temporary heating equipment; heating is generally carried out at night, and short ventilation is carried out around noon, controlling the daytime temperature in the greenhouse at around 20°C and the nighttime temperature above 10°C. Third, supplementary pollination. During the strawberry flowering period, keep bees for supplementary pollination; through bee pollination, the fruit-setting rate can be increased by 50% to 70%, significantly improving strawberry yield and quality and increasing economic benefits.