On the basis of balanced application of various nutrient elements, the correct application of nitrogen fertilizers is particularly important. Several nitrogen-containing fertilizers currently applied in production should pay attention to the following matters during application:
Ammonium bicarbonate: The nitrogen content is about 17%. After applied to the soil, the nutrients of the nutrients can be fully absorbed. No harmful substances are left in the soil. It is a physiologically neutral and quick-acting nitrogen fertilizer. However, ammonium bicarbonate is volatile and should not be applied shallowly. The application depth should be less than 3 cm below the soil layer, and the soil should be immediately covered with soil and timely watered. It is also not suitable to be applied in greenhouses. Because the temperature in the greenhouse is generally high, ammonium bicarbonate is more easily decomposed into ammonia and volatilizes.
Ammonium chloride: Nitrogen content is about 25%, moisture absorption is small, stable at room temperature, is a kind of physiological acidic fertilizer, after the application of soil, nutrient components ammonium ions can be fully absorbed, in the soil of chloride ions (CI-) The quantity can be accumulated and it may poison the crop. Rice, sorghum, millet, cotton, hemp, sugar beet, spinach and other chlorine-resistant crops can be applied on demand. Barley, wheat, corn, soybeans, peas, beans, peanuts, radish, tomatoes, cucumbers and other chlorine-resistant, can be applied in constant. Sweet potato, flue-cured tobacco, lettuce, Chinese cabbage, apples, etc., have weak chlorine resistance and are chlorine crops. It is not appropriate to use ammonium chloride.
Ammonium sulphate: Nitrogen content is about 21%, moisture absorption is small, stable at room temperature, but not long-term application, because the fertilizer is a physiological acid fertilizer, long-term application of acidic soil, will further increase the acidity of the soil, destroy the soil structure. When applied in alkaline soils, ammonium ions in ammonium sulfate are absorbed and sulfate ions remain in the soil and react with calcium, which can harden the soil.
Ammonium Nitrate: Nitrogen content is about 34%, and the effect of fertilizer is large. After being applied to the soil, ammonium and nitrate ions can all be absorbed, and there is no adverse effect on the soil. It is a physiologically neutral and quick-acting nitrogen fertilizer. Because ammonium nitrate can dissociate nitrate ions, it is easily leached into the deep layer of soil in the paddy field, resulting in denitrification and loss of nitrogen, so it is not suitable for application in paddy fields. Applying nitrate fertilizer in dryland is not suitable for use on heavy rain or in rain. After pouring water. In addition, green leafy vegetables should not be applied ammonium nitrate. Such as cabbage, Chinese cabbage, leeks, celery, spinach, etc. These vegetables have a short growing period and are easily absorbed in nitrate nitrogen. Ammonium nitrate is applied. Most of the green leafy vegetables absorb nitrate ions. For vegetables, the shelf life is short and perishable. For people, if you eat these vegetables with high nitrate content for a long time, it will cause cumulative poisoning.
Urea: The nitrogen content is about 45%. It is the fertilizer with the highest nitrogen content in solid nitrogen fertilizer. It is stable in nature, less hygroscopic and soluble in water. It is a high-quality neutral nitrogen fertilizer. Urea has a high nutrient content and is suitable for a variety of soils and crops. When urea is applied to the soil, it can be absorbed and utilized by the crop only after it is converted into ammonium carbonate, so the fertilizer effect is slower but lasts longer. In addition, the application of deep application of soil, do not immediately flooding irrigation application, in order to prevent urea poured to deeper, reduce fertilizer efficiency.
Ammonium bicarbonate: The nitrogen content is about 17%. After applied to the soil, the nutrients of the nutrients can be fully absorbed. No harmful substances are left in the soil. It is a physiologically neutral and quick-acting nitrogen fertilizer. However, ammonium bicarbonate is volatile and should not be applied shallowly. The application depth should be less than 3 cm below the soil layer, and the soil should be immediately covered with soil and timely watered. It is also not suitable to be applied in greenhouses. Because the temperature in the greenhouse is generally high, ammonium bicarbonate is more easily decomposed into ammonia and volatilizes.
Ammonium chloride: Nitrogen content is about 25%, moisture absorption is small, stable at room temperature, is a kind of physiological acidic fertilizer, after the application of soil, nutrient components ammonium ions can be fully absorbed, in the soil of chloride ions (CI-) The quantity can be accumulated and it may poison the crop. Rice, sorghum, millet, cotton, hemp, sugar beet, spinach and other chlorine-resistant crops can be applied on demand. Barley, wheat, corn, soybeans, peas, beans, peanuts, radish, tomatoes, cucumbers and other chlorine-resistant, can be applied in constant. Sweet potato, flue-cured tobacco, lettuce, Chinese cabbage, apples, etc., have weak chlorine resistance and are chlorine crops. It is not appropriate to use ammonium chloride.
Ammonium sulphate: Nitrogen content is about 21%, moisture absorption is small, stable at room temperature, but not long-term application, because the fertilizer is a physiological acid fertilizer, long-term application of acidic soil, will further increase the acidity of the soil, destroy the soil structure. When applied in alkaline soils, ammonium ions in ammonium sulfate are absorbed and sulfate ions remain in the soil and react with calcium, which can harden the soil.
Ammonium Nitrate: Nitrogen content is about 34%, and the effect of fertilizer is large. After being applied to the soil, ammonium and nitrate ions can all be absorbed, and there is no adverse effect on the soil. It is a physiologically neutral and quick-acting nitrogen fertilizer. Because ammonium nitrate can dissociate nitrate ions, it is easily leached into the deep layer of soil in the paddy field, resulting in denitrification and loss of nitrogen, so it is not suitable for application in paddy fields. Applying nitrate fertilizer in dryland is not suitable for use on heavy rain or in rain. After pouring water. In addition, green leafy vegetables should not be applied ammonium nitrate. Such as cabbage, Chinese cabbage, leeks, celery, spinach, etc. These vegetables have a short growing period and are easily absorbed in nitrate nitrogen. Ammonium nitrate is applied. Most of the green leafy vegetables absorb nitrate ions. For vegetables, the shelf life is short and perishable. For people, if you eat these vegetables with high nitrate content for a long time, it will cause cumulative poisoning.
Urea: The nitrogen content is about 45%. It is the fertilizer with the highest nitrogen content in solid nitrogen fertilizer. It is stable in nature, less hygroscopic and soluble in water. It is a high-quality neutral nitrogen fertilizer. Urea has a high nutrient content and is suitable for a variety of soils and crops. When urea is applied to the soil, it can be absorbed and utilized by the crop only after it is converted into ammonium carbonate, so the fertilizer effect is slower but lasts longer. In addition, the application of deep application of soil, do not immediately flooding irrigation application, in order to prevent urea poured to deeper, reduce fertilizer efficiency.
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