No N2O emissions were observed over the storage period (32 days) from any material until the beginning of the fourth week (Fig. 2), after which all the slurries showed an increasing trend. The highest fluxes were observed from the solid fractions (P_SF: 13.21 mg N2O m2 h1 on day 25; C_SF: 4.26 mg N2O m2 h1 on day 32). Considering that the emissions of NH3 had average values >200 mg m2 h1 of NH3-N, it is evident that, of those measured (NH3 + N2O) the predominant N emission was in the form of NH3, representing on average more than 99%.