The functioning of the nitrous oxide (N 2 O) reductase enzyme involved in the last step of denitrification is pH sensitive, with an optimum of 6.8. A solution to mitigate N 2 O emissions would be to bring soil pH close to neutrality by adding agricultural liming products (aglime). Nevertheless, the influence of aglime on the soil greenhouse gas (GHG) balance (CO 2-N 2 O) is a subject of debate, particularly when considering the fate of the carbon (C) derived from carbonates. Our objective was to investigate the results of the effect of calcium carbonate (CaCO 3) aglime on the CO 2-N 2 O balance. Sixteen cylinders of undisturbed acidic soil were taken from a sandy loam profile and incubated at 20 C for 107 days in anaerobic conditions (waterfilled pore space >60%). Eight limed treatment cylinders received 1.45 g of aglime on the soil surface (2 t NV ha À1) and 0.08 g of N (100 kg of N ha À1).