Urea, also known as urea and carbamide, is an organic compound composed of carbon, nitrogen, oxygen and hydrogen, and is a white crystal. One of the simplest organic compounds is a major nitrogenous end product of protein metabolism in mammals and some fish.

As a neutral fertilizer, urea is suitable for various soils and plants. It is easy to preserve, easy to use, and has little damage to the soil. It is a chemical nitrogen fertilizer with a large amount of use and the highest nitrogen content. In industry, ammonia and carbon dioxide are used to synthesize urea under certain conditions