How to increase temperature in a multi greenhouse

1. Improve the thermal insulation of grass curtains in multi story greenhouses. The grass curtain covering the greenhouse should be tight. To improve insulation performance, a layer of ordinary agricultural film or old film from previous years can be added to the grass curtain.

2. Increase the permeability of the greenhouse film. Using high transparency non drip film, timely cleaning of dust, snow, etc. on the greenhouse film can enhance lighting and increase greenhouse temperature.

3. Increase the insulation of the rear wall. When building the back wall, a layer of brick can be pasted on the earth wall, or a hollow insulation wall can be built, and the wall is filled with straw or polystyrene foam. The effect is also very good. In severe cold areas, it can be directly built into a fire wall to improve temperature.

4. Dig a cold proof ditch outside the shed. Dig a cold proof ditch outside the greenhouse with a depth of 40-60 centimeters and a width of 40-50 centimeters, fill it with insulation materials such as sawdust, weeds, horse manure, straw, etc. After compaction, seal the ditch with soil to achieve insulation effect. When the cold current approaches, adding grass curtains or corn straw around the greenhouse at night can increase the greenhouse temperature by 2-3 ℃; Smoke can also be smoked around the greenhouse to prevent the loss of heat around the greenhouse.

5. High ridge cultivation is adopted in the greenhouse. When planting, plastic film can be applied to the ridges, which can increase the soil temperature by 2-3 ℃. When using flat bed cultivation, small arched sheds can be added to increase temperature.

6. Hang reflective curtains inside 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 to reduce the absorption of heat energy by the wall. This can increase the temperature inside the greenhouse by 2-3 ℃, while also increasing the lighting inside the greenhouse, promoting the coloring of fruits such as fruit trees and tomatoes.

7. Establish temporary heating measures. To timely alleviate the impact of meteorological disasters such as cold currents and frost, as well as adverse weather conditions with no sunlight on the normal growth of greenhouse crops, 2-3 heating fans with a power of 1600-2500 watts can be temporarily installed in the greenhouse. To prevent excessive humidity in the greenhouse and electric leakage, a bathroom heater should be used, with the outlet direction of the heater not directly facing the crops.