Table 5: Mean season-long, area- and yield-scaled nitrous oxide (N2O) emissions and total global warming potential (GWP) among tillage practice [i.e., conventional tillage (CT) and no-tillage (NT; n = 8)]-urea fertilizer type [i.e., N-(n-butyl) thiosphosphoric triamide (NBPT)-coated and non-coated urea (n = 8)] treatment combinations measured in 2017 at the Rice Research and Extension Center near Stuttgart, AR.
Treatment combination | Area-scaled N2O emissions (kg N2O-N ha-1 season-1) |
Yield-scaled N2O emissions [kg N2O-N (Mg grain)-1] |
Total GWP (kg CO2 equivalent ha-1 season-1) |
NT/Non-coated urea | 0.50 | 0.06 | 2204 |
NT/NBPT-coated urea | 0.27 | 0.04 | 1972 |
CT/Non-coated urea | 0.47 | 0.06 | 1612 |
CT/NBPT-coated urea | 0.32 | 0.04 | 1324 |