This thesis investigated nitrous oxide (N\sb2O), nitric oxide (NO) and nitrogen oxide (NO\sbx) fluxes from turfgrass (Lolium perenne L.) fertilized with ammonium nitrate, urea and slow-release urea. Measurements were made continuously following micrometeorological techniques during the summers of 1995 and 1996 using a Tunable Diode Laser Trace Gas Analyser for N\sb2O fluxes and a chemiluminescence analyser for NO and NO\sbx fluxes. Emissions of N\sb2O and NO were increased by fertilization, while uptake of NO\sbx was not affected. Duration and magnitude of episode emissions were affected by fertilizer type and climatic variables. Due to increased precipitation in 1996 versus 1995, emissions of N\sb2O were enhanced in 1996, while emissions of NO were enhanced in 1995. Fertilization with ammonium nitrate gave the greatest increase in N\sb2O, while fertilization with urea gave the greatest increase in NO. Application of slow-release urea resulted in a significant reduction of both N\sb2O and NO emissions.