Urea is a kind of amide nitrogenous fertilizer, currently is the most effective component of agricultural solid nitrogen fertilizer in China, the nitrogen content is 46%, is 1.4 times times ammonium nitrate, ammonium sulfate 2.
Twice times, ammonium bicarbonate 2. 7 times times. The effective components of urea are more convenient than other nitrogen fertilizers in transportation, storage, packing and application. Urea
The physical properties of white such as millet large circular particles, soluble in water, in the water temperature 20°c (with the same below), Urea 100 grams of water-soluble soluble 105 grams of urea. In the urea production, adding paraffin wax and other hydrophobic substances, in the ambient temperature drying environment is not easy to absorb moisture caking.
Urea is another advantage of fertilizers, that is, urea is a neutral fertilizer, the long-term application of the soil does not damage. Urea It contains a major component of carbonic acid, which helps carbon
Assimilation can also facilitate the dissolution of insoluble phosphates for crop use.
Urea belongs to organic compounds, it is different from ammonium nitrate, ammonium sulfate, ammonium bicarbonate and other nitrogen fertilizers, urea is dissolved in water in molecular state, the dissociation degree in water is very small, its
The molecular state can also be adsorbed by the soil. Urea into the soil, Urea in addition to the small part of the urea molecular form directly by the crop absorption, most of the conversion of ammonium ions and even nitric acid ions can be used for crop absorption.
Urea is a small molecular weight, Urea can be absorbed by the crop leaf, so urea is a good fertilizer outside the root.
Urea fertilizer usually contains a small amount of urea, the plant seed, bud, young root contact has a certain toxic effect, in the application should pay special attention to maintain the distance of 3 centimeters.
In the process of converting urea into ammonium carbonate, Urea the volatilization loss of ammonia can also be caused, especially in calcareous soil, the volatilization of ammonia is more obvious when urea table is applied. Therefore, urea and ammonium bicarbonate
The sample should be deeply applied to the Earth. In the paddy field application of urea, especially in early spring after application, can not immediately irrigation, because the urea has not been converted into ammonium carbonate, the molecular state dissolved in the soil solution, Urea can not be adsorbed by the soil, easily with water loss.
Urea nitrogen content in the 44%~46%, is the highest nitrogen content in solid nitrogen fertilizer, physical and chemical properties of a relatively stable, pure white or slightly yellow crystals or small particles, nega moisture-proof agent, hygroscopic small, soluble in water, neutral nitrogen. Urea nutrient content is high, suitable for all kinds of soil and a variety of crops, the most suitable for top dressing, Urea root outside the effect is also very good. Urea into the soil, only after the conversion of ammonium bicarbonate can be a large number of crop absorption and utilization. Because of the process of transformation, the effect is slow. It is generally applied 4-6 days in advance. At the same time also requires deep application of soil, not immediately after the irrigation, to prevent nitrogen leaching to the deep, reduce fertilizer efficiency.