Winter is the off season for the use of chemical fertilizers, but most farmers have the habit of using winter fertilizers to store fertilizers. Winter storage fertilizer must be kept safer, otherwise it will not only result in the loss of fertilizer, or even cause major accidents. Safekeeping should be well-handled with the “Four Preventionsâ€: Volatile loss: Ammonium bicarbonate is an unstable compound that easily decomposes itself into ammonia, carbon dioxide, and water, causing loss of nitrogen. The higher the temperature, the faster the decomposition. It was determined that at 20C, ammonium bicarbonate was left open for 1 day in the room, and nitrogen was volatilized to 8.86%; for half an hour, nitrogen was volatilized to 77.25%, so it must be tightly sealed during storage. In the storage room, the plastic bag cannot be damaged. When storing ammonia water, a layer of waste oil can also be added to prevent ammonia volatilization. Nitrogen fertilizers and superphosphates are strictly prohibited from being mixed with lime, plant ash, and calcium magnesium phosphate fertilizers to prevent the loss of nitrogen fertilizers and reduce the fertilizer efficiency of phosphate fertilizers. Anti-absorbing agglomerates: Most solid fertilizers are hygroscopic, and some even become agglomerated after damp. For example, ammonium bicarbonate is liable to absorb moisture and cause ammonia volatilization loss; potassium chloride has hygroscopicity, and moisture is easy to form into a block; ammonium nitrate absorbs moisture easily to cause agglomeration and deliquescence; calcium superphosphate absorbs moisture and agglomeration affects the application effect. Therefore, it must be placed in a dry, cool, ventilated place, should be stored with bricks, wood or other mats to prevent moisture. The height of chemical fertilizer stacking should not exceed 2 meters in general, and the time should not be too long, so as to prevent caking and increase the difficulty of application. Fireproofing and Solarization: Nitrogen fertilizers accelerate the volatilization of ammonia by exposure to sunlight or high temperatures; fertilizers such as ammonium nitrate and potassium nitrate are flammable and explosive; they must be strictly protected from pyrotechnics, violent collisions, or direct sunlight during storage, nor with diesel. Inflammables such as gasoline, firewood, and sulphur are stacked together to prevent explosions and fires. There is often a small amount of calcium carbide impurities in lime nitrogen. After absorption of moisture or water, acetylene will be emitted as a flammable gas. When the gas reaches a certain concentration in the air, it will burn or explode in the presence of open flame. Solarization and pyrotechnics must be strictly prohibited. Bacterial fertilizers should be stored in a heat-resistant sunscreen, preferably in a black cloth pocket to prevent the bacteria from drying out and losing their function. Anti-corrosion poisoning: Chemical fertilizers are generally corrosive, especially strongly acidic and strongly alkaline fertilizers, which are more corrosive. Superphosphate contains free acids and is highly corrosive. It should be protected from contact with skin and metal utensils. Aqueous ammonia is strongly corrosive to copper and iron and should be stored in cement, ceramics, plastics, and wooden containers. At present, these chemical fertilizers stored for use have a pungent odor from their volatilized gases and are toxic to the human body. Long-term exposure should be avoided. We must not combine poisonous fertilizers with food, feed, and agricultural and sideline products to prevent human and animal poisoning.