0 Grosz, B Horváth, L Machon, A 2008 Cereal Research Communications 36 Suppl. 1523-1526 <p>Using the DNDC biogeochemical model we have estimated the soil emissions of greenhouse gases as CO2, N2O and CH4 and emission of some other nitrogen forms (NO, N-2, NH3). Direct determinations of these gasses are difficult due to the expensive instrumentations and/or the problem of the generalization and upscaling of measurements. Soil flux of CH4 was negligible compared to CO2 emission. Emissions of NO and NH3 were more effective comparing to rates of N-2 and N2O. Modelled emissions are in good agreement with the measured fluxes.</p>