Fertigation is an alternative cropping management practice that combines fertilization and irrigation, and it is being employed in China to reduce nitrous oxide (N₂O) emissions while increasing fertilizer use efficiency. A field experiment was conducted at a vegetable field with cucumber and celery planted under greenhouse conditions, in the suburbs of Beijing. The field was divided into 12 plots with 4 treatments. These were a control (CK), routine farmers' practice treatment (FP), farmers' practice with drip irrigation treatment (FPD), and optimal fertilization with drip irrigation treatment (OPTD). FPD consisted of drip irrigation with fertilizers dissolved in the irrigation water. OPTD had the same fertigation but N fertilizer was reduced by 40%. Soil N₂O fluxes were measured by static chambers all year round, and the soil temperature, and soil moisture, ammonium, and nitrate levels were monitored in parallel with the N₂O measurements for all the treatment plots. The application event induced N₂O emission peaks that lasted for about 10-15 days in all the plots. However, all the later dressing events caused relatively short N₂O emissions lasting 3-5 days. During the observation period, the accumulative N₂O emissions differed across the treatments. In comparison with the annual N₂O emission rate of (31.00±2.15) kg N/hm² measured in FP, the N₂O emission rates measured in FPD and OPTD were 4.16% and 42.71% lower, respectively. During the cucumber growing season, the N₂O fluxes were significantly correlated with the soil water filled pore space (WFPS) for all treatments, but during the celery growing season, the N₂O fluxes were significantly correlated with soil temperature for all treatments. The results indicated that optimizing fertilization-irrigation by adopting fertigation could reduce N₂O emissions from agricultural systems.