Will be in winter greenhouses to prevent cold in advance
Winter is a critical period for the growth of strawberries in greenhouses, and it is also the most intense period of temperature change. In the morning and evening, the temperature in the shed is low. In the case of fine weather, the temperature will rise rapidly during the day. Sudden changes in temperature can cause cold damage, wet damage, or dormancy, poor pollination, and create a hotbed for more disease.
Increase the transparency of the shed film. Choose a non-drip film with good light transmission. After snow, clean the snow on the shed film, and regularly clean the dust on the shed film to enhance the light and increase the temperature of the shed. .
The grass cover shed strawberry antifreeze before the cold current is approaching, adding grass hoe or corn stalk around the greenhouse at night, can increase the shed temperature 2 ° C ~ 3 ° C. When the temperature drops suddenly, you can put a layer of ordinary agricultural film or old film on the grass, which can improve the heat preservation of the grass and prevent the rain and snow from getting wet.
Multi-layer film insulation, cold and anti-freeze, double-folding film (also available as waste greenhouse film), width 1 m, sandwiched inside the first layer of greenhouse film (between steel pipe and film), if necessary, in two-layer steel frame film Add a 1 meter wide agricultural film, pull all the way around the greenhouse, can play the role of heat preservation, cold resistance and antifreeze.
Improve the insulation of the back wall of the greenhouse To improve the insulation performance of the back wall of the greenhouse, the following measures can be taken: first, increase the thickness of the wall behind the greenhouse; second, put a layer of brick on the back wall; third, build a hollow insulation wall, inside the wall The hollow part is filled with straw or polystyrene foam board; the fourth is to build a fire wall for warming, this method is suitable for cold regions.
Before the cold smoke around the greenhouse, the crop straw, firewood and so on are ignited around the greenhouse, and the smoke generated by it drives the cold air to raise the temperature around the greenhouse, thereby increasing the temperature inside the greenhouse and achieving the purpose of resisting the cold current.
When the mulch covered in the greenhouse is covered with high ridge, the mulch can be covered with mulch, which can raise the ground temperature by 2 °C ~ 3 °C, and it is also convenient for watering, but the ridge height in the dry area should not exceed 10 cm.
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