On the basis of balanced Application of various elements, the correct application of nitrogen fertilizers is particularly important. At present, several nitrogen-containing fertilizers applied in production should pay attention to the following matters during application:
Ammonium bicarbonate contains approximately 17% nitrogen. After being applied to the soil, the nutrients of the nutrients can be fully absorbed and 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 has a nitrogen content of about 25%. It has low hygroscopicity and is stable at room temperature. It is a physiological acid fertilizer. After being applied to the soil, the nutrients of the nutrients can be fully absorbed, and the amount of chloride ions in the soil can accumulate, possibly causing poisoning to the crop. Rice, sorghum, millet, cotton, hemp, beet, spinach, etc. have strong chlorine resistance and can be applied as needed. Barley, wheat, corn, soybeans, peas, beans, peanuts, radish, tomatoes, cucumbers and other chlorine-resistant, can be applied in constant. Sweet potato, flue-cured tobacco, tea, lettuce, Chinese cabbage, sugar cane, citrus, apple and other chlorine-resistant ability is weak, it is a chlorine-inhibiting crop, and ammonium chloride should not be used.
Ammonium sulphate contains about 21% nitrogen, low hygroscopicity, and stable at room temperature, but it is not suitable for long-term use because the fertilizer is a physiological acid fertilizer. Long-term application of acidic soil will increase the acidity of the soil and damage 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 contains about 34% nitrogen. Fertilizer effect is large. 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 physiologically neutral quick-acting nitrogen fertilizer. Because ammonium nitrate can dissociate nitrate ions, it is easily leached into the deep soil layer in the paddy field, resulting in denitrification and loss of nitrogen, so it is not suitable for application in rice fields. Nitrate fertilizers applied to dry land should not be poured into heavy rain or heavy water after application.
The nitrogen content of urea is 46%, which is the highest nitrogen fertilizer 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 cover should be applied, do not immediately after the application of large water immersion irrigation, to prevent leaching of urea to the deep, reducing fertilizer efficiency.
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