Multi-span greenhouse is a kind of commonly used greenhouses. I believe that many people want to know the techniques for increasing the temperature of greenhouses. The following editor will tell you the techniques for increasing the temperature of multi-span greenhouses for your reference.
1. Multi-span greenhouse improves the thermal insulation of straw curtains. The straw curtain covered on the greenhouse should be tight. In order to improve the thermal insulation performance, a layer of ordinary agricultural film or old film from previous years can be added to the straw curtain.
2. Increase the permeability of the greenhouse film. The use of high-transmittance non-drip film can promptly clean dust and snow on the shed film, which can enhance the light and increase the shed temperature.
3. Increase the thermal insulation of the back wall. When building the back wall, you can paste a layer of brick on the soil wall, or build a hollow insulation wall. The wall is filled with straw or polystyrene foam. The effect is also very good. It can be directly built into a fire wall in severe cold areas to facilitate temperature rise.
4. Dig a cold-proof trench outside the shed. Dig a cold-proof ditch with a depth of 40-60 cm and a width of 40-50 cm outside the greenhouse, and fill it with insulation materials such as sawdust, weeds, horse manure, straw, etc., and seal the ditch with soil to achieve the thermal insulation effect. When the cold current is approaching, add straw curtains or corn stalks around the shed at night to increase the shed temperature by 2-3°C; you can also smoke around the shed to prevent heat loss around the shed.
5. High-ridge cultivation is used in the greenhouse. When planting, you can cover the ridges with a film, which can increase the ground temperature by 2-3°C. When using flat border cultivation, a small arch shed can be added to increase the temperature.
6. Reflective curtains are hung in the shed. Hang a plastic film or tin foil coated with a metal layer on the back wall of the greenhouse, and hang a 1-meter reflective screen every 2-3 meters, which reduces the wall’s absorption of heat energy and can increase the temperature in the shed by 2-3°C. Increase the light in the shed, and promote the coloring of fruit trees, tomatoes and other fruits.
