Effect of Application of Coated Urea and NBPT Urease Inhibitor On Greenhouse Gas Emissions in Cotton Production.

Nitrogen fertilization such as urea likely influences the intensity of emission of greenhouse gases and ammonia. Urease inhibitor (UI) has the potential to improve nitrogen use efficiency and minimize the ammonia volatilization losses from urea. The aim of this study was to investigate the effects of application of urea, coated urea, urea was treated with the urease inhibitor NBPT [N-(n-butyl) thiophosphoric triamide] and denitrification inhibitor DCD [Dicyandiamide] on greenhouse gas emissions from a cotton field. A randomized experiment design with five treatments: 1) Check (unfertilized); 2) Urea; 3) Coated Urea; 4) Urea + NBPT; 5) Urea + DCD. The different fertilizer treatments were applied to the surface of soil. The results showed that N fertilization generally increased the emission of N₂O and CO₂ while CH₄ emission was not significant. Urea produced more N₂O and CO₂ emissions. Both the urease inhibitor NBPT and the nitrification inhibitor DCD reduced the release of N₂O and delayed the peak of N₂O emissions.