Abstract
Urea is the nitrogen source most used in Brazilian and world agriculture; however, overall the Nitrogen Use efficiency (NUE) by plants is low when urea is the N-fertilizer used, especially when the aforementioned fertilizer is applied over the soil surface. In order to reduce volatilization losses, urease inhibitors, such as N-(n-butyl) thiophosphoric triamide (NBPT), mitigates ammonia vo…