Before a cold snap arrives, it's essential to closely monitor weather forecasts from TV and radio stations. Pay attention to temperature fluctuations and prepare accordingly. In terms of management, carefully check the insulation of greenhouse covers, vents, and the warmth of the grasshoppers. On sunny days, increase the greenhouse temperature to store heat. Adjust ventilation by reducing air release during the day and covering the grass or straw in the early morning (around 9 AM) and again in the late afternoon (around 4 PM). Add straw between vegetable rows to provide extra insulation. Spray the foliage with a 0.3% potassium dihydrogen phosphate solution to reduce leaf transpiration. These preparations should start at least three to four days before the cold weather hits.
Once the cold front arrives, avoid watering, spraying, or ventilating the greenhouse. Do not use bactericidal smoke agents, and do not remove the cover unless necessary. If it's snowing or raining, keep the cover closed temporarily. If the weather is cloudy, you can open the cover before 9 AM and re-cover it before 4 PM. If the temperature inside the greenhouse drops below 6°C for melon vegetables or 4°C for eggplants around 8 AM, place 5 to 8 charcoal fires inside to provide additional warmth.
After the cold has passed, this is a critical time when greenhouse vegetables are most vulnerable. After several days of low temperatures, if the weather clears up and the sun shines, don't immediately uncover everything. Gradually lift the cover to help plants adapt slowly from cold to warm conditions. If plants show signs of wilting, you can spray them with a 1% "sweet and vinegar" mixture—made by dissolving 0.5 kg of glucose and 0.5 kg of mature vinegar in 50 kg of warm water. Apply this solution every two to three days to help relieve wilting and promote recovery. Taking these steps will ensure your crops stay healthy through the cold period.
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