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To protect the greenhouse from cold weather, a multi-layer film can be used to cover the structure. This may include double or multi-layer insulation films, or it can be covered with shade cloth, mulch within the shed, or non-woven fabric. These materials help to create an additional barrier against the cold and improve thermal retention.
In addition, installing a second layer of curtains on the inner side of the greenhouse is highly effective. Materials such as straw curtains or reed mats can be used to thicken the air buffer between the inside and outside, significantly enhancing the insulation properties of the structure. This method is especially useful during colder periods when maintaining warmth is critical for plant health.
Another option is using a heating furnace equipped with a properly sealed exhaust pipe to provide warmth during cold spells. It’s important to ensure that the exhaust system is secure to prevent smoke leakage, which could harm the plants. This method provides quick and efficient heating but requires careful monitoring to avoid risks.
Smoking the greenhouse is another technique used to raise temperatures quickly. In a one-acre greenhouse, you can place 2-3 tiles filled with sawdust and ignite them to generate smoke, or pile firewood or charcoal along the walkways. However, care must be taken not to make the fire too large, as this could damage nearby plants. Fire safety is also a top priority in this approach.
Installing warming bulbs is another practical solution. For a one-acre greenhouse, 25 to 30 warming lights can be placed strategically to provide continuous heat throughout the day and night, helping to prevent frost damage to crops.
Electric heating cables are also commonly used, especially in seedling nurseries. They can effectively raise soil temperature and protect plants from freezing. However, this method tends to be more expensive and is generally not recommended for large-scale use due to cost concerns.
Other temporary warming solutions include air heating lines, electric heating wires, space heaters, iodine tungsten lamps, incandescent bulbs, LED energy-saving lamps, and reflective films. These tools are particularly effective in emergency situations where rapid temperature increases are needed. Many growers find these methods to be both efficient and easy to implement.
As technology continues to advance, new and innovative ways to keep greenhouses warm are becoming available. Whether through traditional methods or modern equipment, the goal remains the same: to maintain a stable and healthy environment for plants, even in the harshest winter conditions.