Urea, also known as carbamide, is an organic compound composed of carbon, nitrogen, oxygen and hydrogen, also known as urea, which is a white crystal. One of the simplest organic compounds. Diamide carbonate, molecular formula H2NCONH2 (CO (NH2) 2), molecular weight 60. The major nitrogen-containing end products of protein metabolism in mammals and some fishes.

It is also the nitrogen fertilizer with the highest nitrogen content at present. 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 soil. It is a chemical nitrogen fertilizer which is used in a large amount at present. Urea is synthesized from ammonia and carbon dioxide in industry under certain conditions.