In winter, snowfall can significantly affect vegetable production, especially in greenhouses. Many growers are concerned about how heavy snow impacts their structures and crops. Based on years of hands-on experience, I'd like to share some practical tips to help manage the challenges of snowfall.
One of the main concerns is the weight of snow on greenhouse roofs. For example, if snow accumulates to 10 cm thick, it exerts a pressure of about 1.25 kg per square meter. A greenhouse that's 8 meters wide and 50 meters long has a total roof area of around 350 square meters, meaning the snow could weigh as much as 4,375 kg. Adding the weight of straw or other coverings, such as 50 bundles weighing 25 kg each, brings the total to over 5,625 kg on a half-acre greenhouse. This kind of pressure can easily damage weak or improperly constructed greenhouses, so it's crucial to remove snow regularly and reinforce structures when needed.
During snowfall, covering the greenhouse with straw can help reduce the load on the roof while also providing insulation. The snow itself acts as a natural insulator, helping to keep the inside warmer. After the snow stops, it’s important to quickly remove the top layer of snow from the plastic film and then re-cover the greenhouse at night for added protection.
Snow around the base of the greenhouse should not be removed, as it can act as an additional layer of insulation. Keeping a 1-meter-high snow wall around the structure helps retain heat and protect the foundation.
After a snowstorm, the greenhouse may stay dark and cold for several days. If temperatures drop below 10°C, plant roots stop absorbing nutrients, and new root growth slows down. When the sun finally comes out, sudden temperature increases can cause leaves to transpire too much, while the weakened root system can’t supply enough water. This can lead to permanent leaf wilting and even plant death. To avoid this, gradually increase ventilation—start by opening a quarter of the vents, then slowly add more if no issues arise.
Once the snow clears, don't forget to maintain nighttime insulation. Without clouds, heat escapes quickly, and if the greenhouse isn't well-insulated, temperatures can drop close to freezing. To prevent this, place straw or other materials under the structure before sunset to trap heat. Add extra layers of coverings and consider using temporary heating if necessary.
After the snow melts, certain vegetables like cauliflower, cabbage, garlic, onions, and leafy greens can be protected and cared for. Once the snow thaws, you can apply fertilizer and loosen the soil to encourage healthy regrowth.
Disposable Protective Clothing
Disposable Overalls,Disposable Protective Suit,Industrial Protective Clothing,Disposable Protective Clothing
Xinxiang Huaxi Sanitary Materials Co., Ltd. , https://www.huaximedical.com