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Dernière mise à jour : Mai 2018

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UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

Poster 2 : Digestats_N2O_2014

Poster 2
A. ASKRI1, P. LAVILLE, S.HOUOT, A. TREMIER, P. DABERT

Soil

Valorization of biogas digestates in agriculture, effects on N2O soil emissions: laboratory characterizations

Use of Anaerobic Digestates (AD) as fertilizer is an emergent sector in agriculture. AD qualities are largely affected by organic resource treated in the digester and post-processing’s performed on raw digestates. Large quantities of ammonia present in AD may enhance nitrification and denitrification rates and consequently N2O emissions. This work addresses the effect of AD composition on N2O fluxes according to their feedstocks and post-treatment procedures. We conducted laboratory measurements using treated soil cores with various AD during more than 3 months. -Amounts of AD inputs were adjusted to provide approximately an equivalent of 170 kgNT ha-1 (3 replicates per treatment). Soils were maintained to their WHC (28% w/w) with WFPS. Fluxes were deduced from gas accumulation in an incubator connected an IR Spectrometers (Aerodyne QC-TILDAS for N2O and Licor 820 for CO2 ) during 3 min. Phase separation leads to a more distinct change in N-N2O flux magnitudes With overall Raw emitting more than Solid and liquid emitting the least. Carbon inputs vary largely with AD treatments, between 70 to 5971 kg C ha-1 (higher for the solids lower for the liquids). Phase separation did not result in marked changes in C mineralization. This study underlines the importance of the soil carbon component for N2O fluxes

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