Ozone, also known as oxygen-rich, superoxide, and triatomic oxygen, is an isomeric form of oxygen (O2). Its molecular formula is O3. It is named after a similar lightning odor. Ozone is the most oxidizing agent among the commonly used oxidants. Its disinfection and sterilizing capacity is more than twice that of chlorine. The sterilization speed is 300-600 times that of chlorine, 3000 times that of ultraviolet light, and there is no dead angle. After the reaction, it is reduced to oxygen. It has been identified as a clean oxidizer with high efficiency and no secondary pollution. First, the mechanism of action Ozone is a strong oxidant, oxidizing ability is second only to fluorine (F2), bactericidal effect is equivalent to oxyacetic acid, stronger than formaldehyde, more than 1 times higher than chlorine. The function of ozone sterilization is different from that of general fungicides. Generally, the fungicide is a progressive and cumulative bactericidal action, and the bactericidal action of ozone is rapid. When its concentration exceeds a certain threshold, the disinfection and sterilization effect can even be instantaneously completed. It is through this powerful and rapid oxidation ability that ozone achieves the purpose of killing insects and microorganisms. It is generally believed that the insecticidal mechanism of ozone is that when the insects inhale ozone, the strong oxidation of ozone will oxidize their respiratory and circulatory systems to oxidize, causing them to suffocate to death as a result of ozone sterilization mechanisms. It is generally believed that ozone acts first on microorganisms such as fungi and bacteria. The cell membrane damages the cell membrane and continues to infiltrate into the membrane. It reacts with various components in the cell and produces irreversible changes that lead to metabolic disorders and inhibit their growth until the cell dies. Second, greenhouse greenhouse vegetable disease prevention applications have reported that ozone is a broad-spectrum, high-efficiency, rapid fungicide, it can quickly kill people and animals pathogenic bacteria, viruses and microorganisms, but also pesticides and organic poisons Strong degradation. According to reports, Shaanxi Province has developed a “Greenhouse Vegetable Pest Control Instrumentation†that will place the instrument smaller than a 12-inch TV in a greenhouse or a greenhouse. (Since ozone density is higher than air density, it is usually suspended. The ozone generator is installed at a height of 1.5-2m above the ground in the pedestrian passage. Using air as raw material, high-pressure high-frequency produces high-concentration ozone. As long as ten minutes can make the greenhouse full of insecticidal ozone, even Infiltration into the roots of plants, killing pests and germs, so that greenhouses, greenhouse vegetables in the absence of or less use of pesticides to achieve the purpose of pest control, and provide a new technology for the production of green food. After completing its sterilization and disinfection mission, ozone will be reduced to oxygen after about half an hour, which will also have the effect of promoting plant growth. Ozone in the shed is conducted at night, unmanned, fully enclosed and under high humidity conditions to ensure personnel safety and maintain sufficient ozone concentration. Open doors and windows in time for disinfection and ventilation. The bactericidal effect of ozone in greenhouses and greenhouses is related to the ozone generator's own model, ozone concentration, indoor temperature and humidity, light, fertilizer and water management, crop varieties, and many other factors. Therefore, the use of ozone can be based on the type of vegetables, growth period, The types and severity of diseases and pests, as well as the characteristics of the climate, are adjusted appropriately. Studies have shown that the increase in humidity and the decrease in temperature can enhance the disinfection effect of ozone. Under high humidity, the cell membrane of microorganisms becomes thin, easily damaged by ozone, and can exert better control effects. The ambient humidity of the application of ozone should be above 60%. Below 45%, ozone will have little bactericidal effect on microorganisms in the air. The higher the humidity, the better the bactericidal effect. Some people experimented with greenhouse tomatoes at night (after 18 o'clock in the winter and after 19 o'clock in the summer) to give ozone for 15-20 minutes at intervals of 24 hours. Leaf vegetables were given at 30 minutes in the evening and the interval was better at 48 hours. In general, spraying ozone water is more effective than ozone gas in preventing diseases, and when ozone is dissolved in water, it has stronger and faster sterilization and sterilization. For example, repeated sprays of ozone water before tomato leaf mold and gray mold can prevent disease and prevent the spread of disease. In addition to the ozone gas after the onset of illness, Japan is also supplemented by spraying 0.3-0.5mg/L of ozone water, so that the combination of oxygen and liquid can increase the bactericidal effect. A 7g/h ozonizer was used in the southern greenhouse vegetable base of Shaanxi Branch of the Chinese Academy of Sciences, and compared with greenhouses using conventional pesticides. The results showed that vegetables treated with ozone can protect the vegetables from pesticide contamination, and the growth and development of the plants was significantly enhanced. The high rate of fruit ripening earlier can increase production by 20% to 30% and reduce the cost by 90%. Japan reported that ozone can effectively prevent the disease of tomato, cantaloupe, and cucumber in greenhouses, and can remove mildew and aphids such as eggplants, mushroom heads, and potted flowers, as well as promote plant growth. Soaking seeds with ozone water can disinfect seeds. When using ozone, operators should avoid contact with ozone for a long time. Contact with ozone for a short time will not cause harm to the human body. Working environment ozone concentration is less than 0.1mg/kg is safe, but less than 0.1mg/kg has no killing effect on microorganisms. In short, at present, China’s research on ozone and its applications is not very deep, especially the application research in the vegetable industry has just started, but we can completely predict that ozone will play an increasingly important role in future agricultural production. The role. China Agricultural Network Editor
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