Table 4: Mean pre- (i.e., establishment of the delayed flood to end-of-season flood release) and post-flood-release (i.e., end-of-season flood release to harvest) nitrous oxide (N2O) emissions and post-flood-release fraction of season-long N2O emissions 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 | Pre-flood-release N2O emissions (kg N2O-N ha-1 period-1) |
Post-flood-release N2O emissions (kg N2O-N ha-1 period-1) |
Percent (%) post-flood-release N2O emissions (kg N2O-N ha-1 season-1) |
NT/Non-coated urea | 0.49 | 0.016 | 3.1 |
NT/NBPT-coated urea | 0.26 | 0.009 | 3.4 |
CT/Non-coated urea | 0.45 | 0.014 | 3.1 |
CT/NBPT-coated urea | 0.30 | 0.020 | 6.2 |