We study nitrous oxide (N2O) emissions. Nitrous oxide (N2O) is both, the single most important depleting substance of stratospheric ozone, and potent greenhouse gas (GHG). Around 70% of the global N2O emission is attributed to the activity of soil microbes (i.e., nitrification and denitrification), from which a substantial part comes from fertilized land. We use lab, greenhouse and field experiments where we study the impact of water quality, fertigation regime and irrigation system (surface vs. subsurface drip) on the fluxes from the soil surface. We hope to develop predictive methods for better prediction of N2O emission from agricultural activity.