Multi-layer cover film increases thermal insulation In autumn and winter, a cold autumn rains, the temperature is often falling off the cliff. When the cold current occurs, the temperature drops rapidly and then recovers. In order to extend the growth period of the shed vegetable, the basis is to improve the daily heat preservation of the shed. Generally, a shed film and a non-woven fabric can be added to the shed. 1. Non-woven fabrics are provided on both sides and the north side of the arch shed The two sides of the arch shed have a large contact area with the outside world, and the heat is lost more quickly. In general, the initial location of chilling damage is on either side of the arch shed. Therefore, the vegetable farmers should cover the non-woven fabrics, straw curtains, etc. on both sides of the arch shed, which can greatly enhance the heat preservation. Especially in the east-west arch shed, 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, to ensure that there are no omissions in the vents and the surface, and to reduce the air circulation inside and outside the night arches. 2. Set the shed The shed film is the most commonly used means of insulation for vegetable growers. Adding a film cover can increase the temperature in the shed by 2-4 °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 adding 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 plaque and soft rot. Disease, fungal gray mold, sclerotinia, downy mildew, etc. The vegetable growers can use the air disinfection tablets to disinfect the air once every 3-4 days to control the spread of airborne fungal diseases; spray 5 times a day, spray chlorobromoisocyanuric acid, thiazole zinc, thiabium copper and other agents, spray When the medicine is applied, the stems and leaves and the ground should be sprayed to reduce the spread of surface bacteria. Enhance the ability of vegetables to resist cold The difference in the ability of vegetables to resist cold is critical to prolonging the growth period of vegetables. The cold resistance of the same plants is not constant, but with the constant changes of weather, water and fertilizer conditions, under the conditions of continuous rainy days and other adverse conditions, the photosynthesis products of the plants are insufficient, and the cold resistance will be significantly reduced. Inorganic salts, soluble sugars, amino acids, nucleotides, etc., have a crucial impact on the cold resistance of plants. One of the most important purposes that we usually emphasize to cultivate strong trees is to strengthen the accumulation of organic products, ensure adequate nutrient supply of plants, and maintain the stability of plant resistance. Plant adaptation to stress is also affected by the regulation of hormones. Growth inhibitors such as abscisic acid and ethylene can significantly improve the cold resistance of plants, while growth promoters such as gibberellin and 2,4-D can reduce the cold resistance of plants. In recent years, the use of functional substances such as chitin and alginic acid on vegetables has been verified. Chitin can induce physiological changes in vegetables and produce substances that increase the resistance of vegetables. After spraying with alginic acid, it can induce flower bud differentiation and improve the resistance of vegetables. Before the arrival of the cold current, the vegetable farmers can use nutrients such as whole-nutrient foliar fertilizer, amino acids and sugar or glucose, and spray plants with alginic acid, chitin and ethylene, which can effectively supplement the nutrition of the plant and improve the resistance under adverse conditions. Strengthen management after cold currents 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 farmers should be ventilated early to keep the temperature in the shed rise 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 drops rapidly. 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, it can also add chitin, photosynthetic power, full-nutrient foliar fertilizer, white sugar, etc., to supplement the foliar nutrition, and promote the rapid recovery of leaf function. Disclaimer: Some articles on this website are transferred from the Internet. 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