What are the common nitrogen fertilizers?

What are the common nitrogen fertilizers? What should I pay attention to when using it? Hope that netizens can help introduce common nitrogen fertilizers such as ammonium bicarbonate, ammonium chloride, ammonium sulfate, ammonium nitrate and urea. The farming network has sorted out the product introduction and matters needing attention of the above nitrogen fertilizer, which are listed below for netizens' reference. The characteristics and matters needing attention of ammonium bicarbonate: the general nitrogen content of ammonium bicarbonate is about 17%. After being applied to the soil, the nutrient component ammonium ion can be absorbed completely, and there is no harmful substance left in the soil. It is a kind of physiologically neutral quick-acting nitrogen fertilizer. However, ammonium bicarbonate is volatile and should not be applied shallowly, the application depth should be below 3 cm soil layer, and the soil should be covered immediately after application and watered in time. It is also not suitable to be applied in the greenhouse, because the temperature in the greenhouse is generally higher, ammonium bicarbonate is more easily decomposed into ammonia and volatilized. Characteristics and matters needing attention of ammonium chloride: generally, ammonium chloride contains about 25% nitrogen, has low hygroscopicity and is stable at room temperature. It is a physiological acid fertilizer. After being applied to the soil, ammonium ions can be fully absorbed, and the amount of chloride ions can be accumulated in the soil. It may be toxic to crops. Chlorine-tolerant crops such as rice, sorghum, millet, cotton, hemp, sugar beet and spinach are strong and can be applied as needed. Barley, wheat, corn, soybeans, peas, broad beans, peanuts, radishes, tomatoes, cucumbers and other moderate chlorine tolerance, can be applied according to the normal amount. Sweet potato, flue-cured tobacco, lettuce, cabbage, apple and other chlorine-tolerant crops are taboo crops, so it is not suitable to apply ammonium chloride. Characteristics and matters needing attention of ammonium sulfate: generally, ammonium sulfate contains about 21% nitrogen, has low hygroscopicity and is stable at room temperature, but it is not suitable for long-term application, because the fertilizer is physiologically acidic fertilizer, and long-term application in acidic soil will further increase the acidity of the soil and destroy the soil structure. When applied in alkaline soil, after the ammonium ion in ammonium sulfate is absorbed, the residual sulfate ion reacts with calcium in the soil, which can make the soil hardening. The characteristics and matters needing attention of ammonium nitrate: generally, the nitrogen content of ammonium nitrate is about 34%, and the fertilizer effect is great. After being applied to the soil, ammonium ion and nitrate ion can all be absorbed, and there is no adverse effect on the soil. It is a kind of physiologically neutral quick-acting nitrogen fertilizer. Because ammonium nitrate can dissociate nitrate ions, it is easy to be leached into the deep soil in rice fields, resulting in denitrification and loss of nitrogen, so it is not suitable to be applied in paddy fields, and the application of nitrate nitrogen fertilizer in dry land is not suitable to pour water on rainy days or after application. In addition, green leafy vegetables should not be applied with ammonium nitrate. Such as Chinese cabbage, Chinese cabbage, amaranth, celery, spinach and so on, these vegetables have a short growth period and are easy to absorb nitrate nitrogen. With the application of ammonium nitrate, green leafy vegetables mostly absorb nitrate ions. For vegetables, the shelf life is short and perishable. For people, if you eat these vegetables high in nitrate for a long time, it will cause cumulative poisoning. The characteristics of urea and matters needing attention: the general nitrogen content of urea is about 45%. It is a kind of high-quality neutral nitrogen fertilizer with the highest nitrogen content in solid nitrogen fertilizer with stable properties, low hygroscopicity and easy to dissolve in water. Urea has high nutrient content and is suitable for all kinds of soil and crops. When urea is applied into soil, it can be absorbed and utilized by crops only after it is converted into ammonium carbonate, so the fertilizer effect is slow, but it is long-lasting. In addition, the application should be deeply covered with soil, and the application should not be flooded immediately, so as to prevent urea from dripping into the deep layer and reduce the fertilizer efficiency. Click to get more nitrogen, phosphorus, potassium application techniques click to get more chemical fertilizer application techniques