Urea, also known as carbamide (carbamide), is composed of carbon, nitrogen, oxygen, hydrogen organic compounds, also known as urea, is a white crystal. One of the simplest organic compounds is the primary endothermic product of protein metabolism in mammals and certain fish. Is currently the highest nitrogen content of nitrogen fertilizer. As a neutral fertilizer, urea is Urea suitable for a variety of soils and plants. It is easy to save, easy to use, the destruction of the role of the soil is small, is currently a large amount of chemical nitrogen fertilizer. Industrial use of ammonia and carbon dioxide under certain conditions, synthetic urea.
Dermatology to contain some of the drugs to improve the skin moisture. Non-surgical removal of nails used in closed dressings containing 40% urea.
The carbon-14-breath test in the presence of Helicobacter pylori was tested using urea containing carbon 14 or carbon 13 labeled. Because Helicobacter pylori urease uses urea to make ammonia to increase the pH of its surrounding stomach. The same principle can also test similar bacteria living in the stomach of animals.
Urea is a high concentration of nitrogen fertilizer, is a neutral quick-acting fertilizer, can also be used to produce a variety of compound fertilizer. In the soil does not leave any harmful substances, long-term use without adverse effects. Livestock can be used as feed for ruminants. But in the granulation of the high temperature will produce a small amount of biuret, also known as biuret, inhibit the crop. China's provisions of urea urea urea urea dosage should be less than 0.5%. Urea Bioderea content of more than 1%, can not do fertilizer, fertilizer and foliar fertilizer, other application period of urea content should not be too much or too concentrated.
Urea is an organic nitrogen fertilizer, through the soil urease action, hydrolysis into ammonium carbonate or ammonium bicarbonate, can be absorbed by crops. Therefore, the urea should be applied 4 to 8 days before the crop needs.
Urea is suitable for basal and top dressing, and sometimes for seed. Urea in the transformation before the molecular state, can not be soil adsorption, should be prevented with the loss of water; conversion after the formation of ammonia is also volatile, so urea should be deep casing. (Soil conversion into the soil in a small part of the molecular state dissolved in soil solution, by hydrogen bonding by soil adsorption, most of the other under the action of urease hydrolysis into ammonium carbonate, and then generate carbonic acid and ammonium hydroxide.Then NH4 + Can be absorbed by plants and soil colloid adsorption, HCO3 can also be absorbed by plants, so urea does not leave any harmful ingredients after the application of urea Urea in addition to urea containing biuret can also be decomposed into urea and carbonic acid under the action of urease, Urea in the soil by the soil PH value, temperature and moisture, the soil was neutral reaction, the appropriate water when the soil temperature is higher, the faster the conversion; when the soil temperature of 10 ℃ when the urea is fully converted to ammonium nitrogen need 7 - 10 days, when 20 ℃ to be 4 - 5 days, when the 30 ℃ to be 2 - 3 days can be generated after the hydrolysis of urea nitrogen ammonium, the table will cause the evaporation of ammonia, especially alkaline or alkaline The soil is more serious, so in the application of urea should be deep soil cover, paddy fields to deep into the reduction layer.
Urea is suitable for all crops and all soils and can be used as basal and topdressing.