Methods of raising the temperature of greenhouses

Covering for Heating:

- Covering with Insulating Film: Use plastic films with good light transmittance and strong heat insulation properties, such as EVA film and PO film, to cover the greenhouse. This effectively reduces heat loss. Multiple layers of covering can also be used, such as adding a second layer of film or a small arched shed inside the greenhouse.

- Covering with Insulating Curtains: Cover the outside or inside of the greenhouse with straw curtains, insulating blankets, etc. These can be lowered at night to block heat loss and rolled up during the day to facilitate light penetration and heating.

Light Heating:

- Choosing the Right Greenhouse Site and Type: Select a high-lying location with good sunlight for the greenhouse. Use greenhouse types with large light-receiving surfaces, such as arched greenhouses or solar greenhouses, to ensure the greenhouse receives ample sunlight in winter.

- Using Reflective Curtains: Hang reflective curtains on the north wall inside the greenhouse to reflect light onto the ground and crops, increasing light intensity and temperature.

Heating Equipment for Heating:

- Stoves: Place stoves inside the greenhouse to generate heat by burning fuels such as coal. This is suitable for smaller greenhouses.

- **Heating with a Heater:** A heater converts electrical or fuel energy into heat, which is then blown into the greenhouse by a fan. This method provides rapid heating and relatively even temperature distribution.

- **Heating with Electric Wires:** Electric heating wires are buried in the greenhouse soil. When powered on, they generate heat, raising the soil temperature. This method is commonly used in seedbeds or small planting areas.

Improving Soil and Air Environment and Raising Temperature

- **Heating through Compost Fermentation:** Fresh horse manure, straw, etc., are piled up inside the greenhouse, allowing them to ferment and generate heat. This also increases the carbon dioxide concentration, which is beneficial for crop growth.

- **Ventilation and Temperature Regulation:** Appropriate ventilation at midday on sunny days removes moisture and cold air from the greenhouse and introduces warm outside air, raising the temperature inside.