In greenhouses, young and weak seedlings are more vulnerable to cold damage. To protect them, it's advisable to cover the seedlings with a layer of protective structures, such as temporary sheds or covers. This double-layer protection can significantly reduce the risk of frost injury and help maintain a stable temperature for the plants.
Another effective method is using straw curtains. These can be made from woven straw stalks and placed over the greenhouse at night, then rolled up during the day. This not only helps regulate temperature by slowing down heat loss but also prevents frost from forming on the greenhouse film, ensuring better insulation.
Irrigating the greenhouse before a frost event can also help. Water has a high heat capacity, so when the temperature drops outside, the moisture in the soil releases heat gradually, helping to keep the air inside the greenhouse warmer. This can provide a more favorable environment for fruit and vegetable seedlings to continue growing without being affected by the cold.
For smaller greenhouses, placing hot water containers inside before a cold front arrives can be beneficial. As the water evaporates, it releases warm vapor that raises the internal temperature, offering additional frost protection.
Additionally, when frost is expected, burning smoldering materials outside the greenhouse at night can generate smoke that traps heat near the structure. This method can raise both the surrounding and internal temperatures, further protecting the plants from freezing conditions.
By combining these methods, growers can create a more resilient environment for their crops, ensuring they remain healthy even during unexpected cold spells.
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