Assessing N emissions from organic residues spreading: Study of the on-field distribution patterns influence and of emission models sensitivity

A. Gueudet (1) , Marilys Pradel (2) , J.C. Roux (2) , A. Lellahi (3) , P. Vissac (1)

1 Acta - Les instituts techniques agricoles
2 UR TSCF - Technologies et systèmes d'information pour les agrosystèmes
3 Service Agronomie Economie Environnement

Recycling organic residues by direct spreading not only brings ecosystemic services but also induces emissions on field. Estimating N-N2O, N-NH3 and N-NO3 emissions on field according to the technological performances of spreading machines considering different cultural systems, weather and climate conditions, various distributions on the field and different emission models was studied. Organic residue distributions in the field were considered as Gaussian distributions using mean, bias and standard deviation. The study showed that N-N2O emissions estimated with the STICS model are rarely sensible to distribution and mostly depend on weather and climate conditions. Concerning the other types of emissions obtained with the STICS model and all the results from the IPCC method, the bias of the distribution seems to be the parameter which influences most the results. Ammonia emissions, in particular, show variability according to the scenario and the distribution pattern for all the emission models used.

Mots clés: DECHET ORGANIQUE; AZOTE; MODELE; EMISSION GAZEUSE; EPANDAGE

Domaines: Sciences de l'environnement

A. Gueudet, Marilys Pradel, J.C. Roux, A. Lellahi, P. Vissac. Assessing N emissions from organic residues spreading: Study of the on-field distribution patterns influence and of emission models sensitivity. 15th International conference Ramiran, Jun 2013, Versailles, France. 4 p. ⟨hal-00947801⟩