Ten ways to keep warm in greenhouse in winter

Thickening the wall and increasing the thickness of the greenhouse wall can increase the temperature by 2 ~ 3℃; Add a cold ditch, dig a cold ditch around the greenhouse and fill it with polystyrene board; Semi-underground buildings, when building greenhouses, make the ground height 1 m and the underground depth 0.5 m; Add a cover, and the top cover will be increased to about 5cm; Cover the soil with plastic film, and cover the soil with waterproof and airtight film cloth.

1, thickened wall

The wall thickness of the greenhouse is increased to 3.2m at the bottom of the back wall, 2.2m at the top, 3.5m at the bottom of the side wall and 2m at the top. After the increase, the temperature can be increased by 2 ~ 3℃, and heating equipment such as heating can be installed indoors.

2. add a cold ditch.

In winter, a cold-proof ditch can be added to the outside of the greenhouse wall, and a big ditch with the same length, depth of 0.8 m and width of 0.4 m can be added. After the cold-proof ditch is 8cm, it can be filled with polystyrene board, which can increase the temperature by 3 ~ 5℃.

3. semi-underground buildings

When building greenhouses in winter, it is suggested to use semi-underground buildings. When the height above ground is 1m and the underground is 0.5m, the temperature in the greenhouse can be increased by 1℃, and the minimum temperature can be increased by 2℃ when the underground depth is1m..

Add mulch

In winter, the top of the greenhouse needs to be covered with thermal insulation materials such as straw and cotton curtain. The normal thickness is 2 ~ 3 cm, which can be increased to about 5cm when the supporting force of greenhouse allows, which can effectively increase the temperature by 3 ~ 5℃ to achieve the heat preservation effect.

Step 5 cover with plastic film

When building a greenhouse in winter, using impermeable plastic film cloth as a cover can increase the soil temperature by 2 ~ 3℃ and keep warm effectively. Plastic film can also isolate some pests in the soil and reduce diseases.

6. Ridge cultivation

When you build a greenhouse in winter, you can dig and ridge the land and then cultivate it. It is suggested that the height of furrow and ridge is 15 ~ 20 cm and the width is about 30cm. Ridge can increase the surface area of plant roots, receive more light and improve the ability to absorb heat.

7. Complete film coverage

When building a greenhouse in winter, two ridges and three films can be used for full coverage. When furrowing and ridging, the formwork is supported on the furrow and ridge, and the formwork is covered with plastic film to make an arched shed. Using ridge soil on both sides of plastic film to press the side door to form two ridges and three films can effectively raise the temperature.

8. Replace the membrane material.

Ordinary greenhouses are built with bamboo poles and bamboo sheets to support film cloth. In winter, materials can be changed to enhance the transparency of the greenhouse, improve the internal temperature and keep warm. For example, iron wire is used to replace bamboo poles, and plastic rope is used to replace bamboo chips.

9. The walls are painted black

In winter, the outer wall of the greenhouse can be painted black, and the temperature in the greenhouse can be raised to keep warm by using the principle of black heat absorption. It absorbs heat when the sun shines in the daytime, and when the temperature drops at night, it forcibly sends the residual heat on the shed to the inside to achieve the heat preservation effect.

10, with brewing heat between rows.

In winter, the greenhouse can be covered with hot brewing materials, such as leaves, hay, sawdust, straw and so on. To achieve the effect of heat storage during the day and heat release at night, increase the minimum temperature by 2 ~ 3℃, reduce diseases and reduce groundwater evaporation.