"Big snow" is approaching, the weather is colder, and cold currents will invade more and more frequently. Sudden cooling will bring serious challenges to greenhouse vegetable production. Therefore, vegetable farmers should be vigilant, take cold and frost protection measures in time, and reduce unnecessary losses. The cold current has a great influence on the growth of vegetables, especially the early growth of vegetables. When the seedlings encounter a low temperature, they first show a decline in the absorption function of the seedling body and hinder the absorption of water and nutrients. Such as tomatoes, cucumbers are more sensitive to temperature, their root hair at 10 °C ~ 12 °C, the ability to absorb nutrients will be affected, the lack of nutrients will follow. When the vegetables are damaged, the symptoms are obvious: If the roots of the seedlings are small and small, new roots are not easy to occur, causing the seedlings to be small, low in height, with fine stems, small leaves, and easy to drop and drop fruits. Seedlings under the influence of low temperature, chlorophyll formation will be inhibited, photosynthesis significantly reduced, the young leaves of the lack of green or bleaching, in serious cases will directly cause the seedlings to stop growing. In addition, the greenhouse usually has relatively large humidity, and the crop grows in a high-humidity environment for a long time. Suddenly it encounters cold air intrusion. In the case of low temperature and high humidity, it can easily cause root diseases, such as tomato stalk rot and cucumber vines. Blight and gray mold of solanaceous vegetables. So, how to deal with the cold weather and ensure that vegetables are not affected by chilling and freezing, so that they can achieve safe production? 1. Change seedlings to promote seedlings, give seedlings a suitable temperature, and promote seedling growth. In cold weather, increase the cover, temporarily warm, indoor temperature can be controlled at about 28 °C, try to increase the temperature. 2. After the cold root seedlings are found, seaweed gene or microbial fertilizer can be used to irrigate the roots, and appropriate water can be used to promote the growth of their roots. 3. The cold days should also be promptly ventilated. At present, greenhouse vegetables are in the early stage of growth. Since most of the greenhouse fertilizers use a large amount of manure, if the ventilation is not smooth, it will be prone to produce fertilizer and carbon dioxide gas hazards in cold weather. 4. In cold weather, flooding should be prohibited. In the cool weather, the temperature and ground temperature in the greenhouse are not high. If the humidity is increased, root rot and root rot easily occur. If topdressing should be dominated by microbial fertilizers, generally do not use chemical fertilizers. 5. Pharmacy prevention of cold damage. In cold weather, it is possible to spray 4000 times liquid natural brassin lactone BF 810 or Pidgin fish protein 800 times, spray it once every 7 days, and spray it twice to prevent freezing damage. Vaseline Gauze,Vaseline Gauze Pads,Vaseline Coated Gauze,Sterile Vaseline Gauze Henan Anbang Medical Supplies Co., Ltd. , https://www.anbangmedical.com