Methane is second most potent greenhouse gas emitted under anaerobic condition in rice soils. Effects of different nitrogen fertilizer application on methane emissions in flooded paddy field were studied. The experiment was laid out in a randomized complete block design with three treatments and three replications. The treatments were control (0 kg N ha^-1), urea (120 kg N ha^-1) and ammonium sulfate (120 kg N ha^-1). In all treatments P (60 kg P₂O₅ ha^-1) along with K (40 kg K₂O ha^-1) were also applied as basal dose. The cumulative seasonal methane flux was highest in urea 36.3 (kg ha^-1) followed by control 35.2 (kg ha^-1) and ammonium sulfate 28.5 (kg ha^-1). Ammonium sulfate application reduced total seasonal emission by 19.5% as compared to control while it reduced CH₄ emissions by 21.6% as compared to urea application. On the basis of this study we can conclude that application of ammonium sulfate is an effective tool for mitigating methane emissions from rice soils.