Which fertilizers are nitrogen fertilizers? What is the role of nitrogen fertilizer? The main types of nitrogen fertilizers are urea, ammonium sulfate, ammonium chloride, ammonium hydrogencarbonate and ammonium nitrate. The medium leaves of diammonium phosphate contain 16% of nitrogen, but mainly phosphate fertilizer.
Urea, a neutral fertilizer, does not cause changes in the acidity and alkalinity of the soil. Urea is converted into ammonium bicarbonate by the action of urease in the soil and absorbed by the crop. Urea is generally used as a base fertilizer and top dressing, but it is not recommended as a fertilizer. If used as a seed fertilizer, it is recommended to keep a certain distance from the seeds to avoid burning the seeds. Urea has the property of seeing light decomposition, so it is not recommended.
Ammonium sulfate, ammonium chloride and ammonium hydrogencarbonate are all available nitrogen fertilizers with low nitrogen content, all of which are around 20%. Due to the short duration of fertilizer effect and quick response to fertilizer efficiency, it is generally common to use ammonium sulfate or ammonium chloride as a top dressing field. The average application rate is generally about 5-9 kg, and the duration of fertilizer effect is about 7-10 days. For ammonium chloride, some chlorine-tolerant crops such as tea trees and tobacco are prohibited. What is the role of nitrogen fertilizer? Nitrogen fertilizer, the main component is total nitrogen, which is responsible for the vegetative growth and reproductive growth of crops, and is the highest nutrient element in crops. It also has the function of participating in the synthesis of enzymes in the body, the synthesis of proteins and chloroplasts, and participating in photosynthesis.
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