The two sides of the greenhouse, the north side, etc., are covered with non-woven fabrics, straw curtains, etc. on both sides of the cover, which can improve the heat preservation property. Especially in the east-west greenhouse, a straw wind barrier can be set on the north side to reduce air flow and reduce heat loss.
The cover film is covered with a film covering in the shed to increase the temperature in the shed by 2 °C - 4 °C. When the outside temperature drops below 8 °C, a greenhouse film should be added to the shed to maximize the night temperature in the shed and promote vegetable growth. After the addition of the greenhouse film, it is necessary to strengthen the temperature and humidity regulation, especially after the ventilation is deteriorated, it is easy to produce dripping water, and the humidity in the shed is greatly increased. It is necessary to pay attention to strengthening the prevention and control of bacteria and fungal diseases. Vegetable farmers can use air disinfection tablets for air disinfection once every 3-4 days to control airborne fungal diseases; spray chlorobromoisocyanuric acid, thiazole zinc, thiabium copper and other agents at intervals of 5-7 days to reduce surface The spread of germs.
After strengthening the management cold wave after the cold current, it is necessary to strengthen management to reduce the secondary injury of vegetables after the cold current. First, pay attention to the slow temperature rise. At this time, the vegetable growers should be ventilated early to keep the temperature in the shed rising steadily. The maximum temperature in the morning should not exceed 25 °C to ensure the recovery time of the damaged tissue of vegetables. The second is water spray humidification, early ventilation after sunny days, the humidity in the shed is falling fast. When the plants are wilting, they should immediately spray warm water on the plants to increase the humidity in the shed and reduce the transpiration intensity of the leaves. The third is to supplement nutrients. When spraying water, you can also add chitin, photosynthetic power, full-nutrient foliar fertilizer, white sugar, etc., to supplement the leaf nutrients, and promote the rapid recovery of leaf function.
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