Urea, also known as urea or carbon amide, has a chemical formula of CH4N2O or CO(NH2)2 . It is an organic compound composed of carbon, nitrogen, oxygen, and hydrogen. It is a white crystal. One of the simplest organic compounds, it is the major nitrogen-containing end product of protein metabolism in mammals and some fish.
As a neutral fertilizer, urea is suitable for a variety of soils and plants. It is easy to store, convenient to use, and has little damage to the soil. It is a chemical nitrogen fertilizer that is used in large quantities and is also the nitrogen fertilizer with the highest nitrogen content. Industrially, ammonia and carbon dioxide are used to synthesize urea under certain conditions.
1. Urea is a high-concentration nitrogen fertilizer, a neutral quick-acting fertilizer, and can also be used to produce a variety of compound fertilizers. No harmful substances remain in the soil, and long-term application will have no adverse effects. Livestock can be used as feed for ruminants.
2. Urea is an organic nitrogen fertilizer. It is hydrolyzed into ammonium carbonate or ammonium bicarbonate by the action of urease in the soil before it can be absorbed and utilized by crops. Therefore, urea should be applied 4 to 8 days before the fertilization period of the crop.
3. Urea is suitable for use as base fertilizer and top dressing, and is sometimes used as seed fertilizer. Urea is in a molecular state before conversion and cannot be adsorbed by soil, so it should be prevented from being lost with water; the ammonia formed after conversion is also volatile, so urea must be applied deeply with soil.
4. Urea is suitable for all crops and all soils. It can be used as base fertilizer and top dressing, and can be applied to both dry and paddy fields.
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