Strawberries in greenhouses need to be kept warm after winter

Increase the transmittance of the shed film. When building the shed, choose a non-drip film with good light permeability. Clean the snow on the shed film in time after snow, and regularly clean the dust on the shed film, etc. to enhance the light and increase the shed temperature.

Strawberry thatch canopy is antifreeze. Before the cold current approaches, adding grass thatch or corn stalks around the greenhouse at night can increase the temperature of the greenhouse by 2℃～3℃. When the temperature drops sharply, a layer of ordinary agricultural film or old film can be added to the grass thatch, which can not only improve the heat preservation of the grass thatch, but also prevent rain and snow from wetting the grass thatch.

Three-layer film heat preservation and cold resistance. Double-fold the film (waste greenhouse film can also be used), with a width of 1 meter, and place it on the inner side of the first layer of greenhouse film (between the steel pipe and the film). If necessary, add a 1 meter wide film to the second layer of steel frame film. The agricultural film is stretched tightly along the periphery of the greenhouse, which can keep warm and resist cold and freeze.

The coal stove is heated to resist cold and frost. Place 3 to 5 coal stoves per acre in the strawberry greenhouse for heating. The time starts at 6 o'clock in the evening and ends at 6 o'clock in the morning, and repeats for the next few days. In order to prevent the influence of gas on strawberries during the heating process, a chimney should be added to the coal stove to ensure that the gas is discharged outside the shed or smokeless charcoal is used.

Improve the thermal insulation of the back wall of the greenhouse. In order to improve the thermal insulation performance of the rear wall of the greenhouse, the following measures can be taken: one is to increase the thickness of the rear wall of the greenhouse; the second is to paste a layer of brick on the rear wall; the third is to build a hollow insulation wall, and the hollow part of the wall is filled with straw or polystyrene Foam board; the fourth is to build a fire wall, which is convenient to raise the temperature. This method is suitable for severe cold areas.

Smoke around the greenhouse. Before the cold current comes, light crop straws, firewood, etc. around the greenhouse, and use the smoke generated to drive away the cold, so that the temperature around the greenhouse will rise, thereby increasing the temperature in the greenhouse and achieving the purpose of resisting the cold current.

Plastic film coverage. When strawberries are cultivated on high ridges in the greenhouse, the ridges can be covered with plastic film, which can increase the ground temperature by 2°C to 3°C and facilitate watering. However, the ridge height should not exceed 10 cm in dry areas.

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