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