With the advent of winter, the temperature in the north gradually declines, and the tomato cultivated in wintering greenhouses faces a low temperature test. Tomato is a thermophilic crop and its tolerance in cold environments is limited. When the tomato or nursery is cultivated in winter and spring or deep winter season, it will suffer low temperature and chilling when it encounters low temperature or frost. When the temperature of deep winter greenhouse is 5°C～10°C for a long time, the leaves will appear dark green or flooded. When the temperature continues to linger at 5°C, the leaves will lose their green edges. In the sudden encounter of large temperature changes in frost (temperature below 2 °C), anthocyanin increased the leaves to show purple and wilting to death. In the low-temperature environment where the temperature is below 5°C for a long time, the plants will lose their green due to cold damage and become white-like, and the plants will die due to chilling injury. For this reason, in the deep winter when the temperature is relatively low, if there is chlorosis of leaves, the first consideration should be the low-temperature freezing damage. In the low-temperature environment where tomatoes live for more than 5°C for a long time, the plants will lose their green due to chilling and become white. In severe cases, the whole plant will die due to chilling injury. Attention should be paid to the timely adoption of antifreeze measures to minimize unnecessary Loss. Freezing damage remedies: First, choose cold-resistant, low-temperature, low-light varieties; Second, starting from the insulation, improve the insulation measures of the greenhouse. The thickness of the earth wall can be increased, the density of the grass carpet can be increased, and the measures such as the arch shed in the greenhouse can be used to increase the temperature and resist cold. Suddenly encounter frost and cold, temporary heating measures should be taken to burn the coal stove or shop floor hotline. Third, the use of cold-resisting agents can be used for chemical control. It can be used in 3.7% to 50% of WP wettable powder, or 15 liters of water plus 50 grams of brown sugar plus 0.3% of potassium dihydrogen phosphate. This can greatly reduce the risk of freezing injury. Loss caused. Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone Nucleic Acid Extraction Reagent Kit The nucleic acid extraction kit is divided into two methods: automatic extraction and manual extraction. Our 64T and 96T are used in automatic extraction equipment, and 100T and 300T are used in manual extraction methods. We can also customize according to customer requirements to meet the needs of different customers. SARS-CoV-2 purification reagent kit,DNA extracting reagent,covid-19 isolation reagent,DNA isolation reagent,DNA purification reagent Shenzhen Uni-medica Technology Co.,Ltd , https://www.unimedicadevice.com