Little information is available on the effects of irrigated crop management practices on nitrous oxide (N₂O) emissions. Nitrous oxide emissions were monitored from irrigated cropping systems receiving N fertilizer rates ranging from 0 to 246 kg N/ha during the 2005 and 2006 growing seasons. Cropping systems included: conventional-till (CT) continuous corn (CC) (CT-CC); no-till (NT) CC (NT-CC); NT corn-dry bean (NT-CDb); and NT corn-barley (NT-CB). In 2005, half the N fertilizer rate was applied as urea-ammonium nitrate (UAN) at planting to the corn plots with the second half of the N rate applied as a surface broadcast polycoated urea (ESN^®) in mid-June. All N was applied as UAN at planting on the NT-CB barley and NT-CDb dry bean plots in 2005. All plots were in corn in 2006, with ESN^® being applied at half the N rate at corn emergence and half as dry urea about the V6-V7 corn growth stage, both surface banded in the corn row followed by irrigation. Fluxes of N₂O were measured from planting until crop harvest using static, vented chambers, one to three times per week, and a gas chromatograph analyzer. Growing season N₂O emissions increased linearly with increasing N-fertilizer rate each year in all cropping systems, but emission amounts varied with years. Growing season N₂O emissions were generally greater from the NT-CDb system during the corn phase of the rotation than from the other cropping systems. Crop rotation and N fertilization rate had more effect than tillage system on N₂O emissions. The amount of N₂O emitted from N fertilizer application ranged from 0.30 to 0.75% of N applied. Spikes in N₂O emissions following N fertilizer application were much greater with UAN and urea than with ESN^® fertilizer. ESN^® showed potential for reducing N₂O emissions from irrigated cropping systems.