Urea is a kind of nitrogen fertilizer, which is used widely. It is used in
large quantities in agricultural production in China and all over the world as
well. But because urea is used in the surface of soil, it can react with soil
urease, and is hydrolyzed rapidly in to ammonium carbonate; therefore it is
easy for ammonia to evaporate. Because of the key function of urease to
urea fertilizer in transformation in ...