After entering the winter, the temperature tends to fall off the cliff. When the cold current occurs, the temperature drops rapidly and then recovers. In order to make the facility vegetables grow well in cold weather, it is necessary to improve the daily insulation performance of the greenhouse and strengthen various management and protection measures.
1. Covering the sides and sides of the greenhouse
The sides of the greenhouse are in contact with the outside world, and the heat is dissipated quickly. Vegetable farmers should cover non-woven fabrics, straw curtains, etc. on both sides of the greenhouse to greatly enhance their heat preservation. 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. In addition, the vegetable farmers should pay special attention to the repair of the damaged parts, reducing the air circulation inside and outside the arch shed at night.
Second, set the greenhouse film
The shed film is the most commonly used means of insulation for vegetable growers. A layer of film is added to the shed to increase the temperature in the shed by 2 ° C to 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 control, 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 such as bacterial angular spot disease and soft rot. Disease, fungal gray mold, sclerotinia, downy mildew, etc. Vegetable growers can use air disinfection tablets for air disinfection once every 3 to 4 days to control airborne fungal diseases; spray chlorobromoisocyanuric acid, thiazole zinc, thiabium copper and other agents at intervals of 5 to 7 days to reduce surface The spread of germs.
Third, strengthen the management after the cold current
After the cold wave, the weather quickly turned fine, and the temperature in the shed generally rose faster. It was necessary to strengthen management and reduce the secondary damage 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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