Nitrous oxide and ammonia emissions from farmland need to be abated as they directly or indirectly affect climate warming and crop yield. We conducted a two-year held experiment to investigate the effect of biochar applied at two rates (no biochar application vs. biochar applied at 10 t ha(-1)) on gaseous nitrogen (N) losses (N2O emissions and NH3 volatilization), plant N uptake, residual soil mineral N, and peanut (Arachis hypogaea L.) yield under three irrigation regimes: furrow irrigation (FI), drip irrigation (DI), and mulched drip irrigation (MDI). We found that MDI reduced residual (post-harvest) soil mineral N, cumulative N2O emissions, and yield-scaled N2O emissions as compared to FL Blocher application increased residual soil NO3--N and decreased yield-scaled N2O emissions as compared with the control without biochar application. Under the three irrigation regimes, biochar application decreased cumulative NH(3 )volatilization and increased plant N uptake and yield compared with the control. Biochar application improved the sustainability of peanut production and could be used to alleviate the environmental damage associated with gaseous N emissions. Where possible, biochar application under MDI in peanut fields is recommended as a management strategy to minimize gaseous N losses.