Contribution du traçage isotopique 15N à l'étude du devenir des émissions azotées gazeuses du lisier

Abstract

15N tracer techniques are usually recognised as a unique tool to follow nitrogen turn-over from soil-plant studies, particularly from nitrogen fertilizer applications, they remain poorly documented in studying losses from animal manures. Direct labelling of animal manure with 15N is possible by incorporating 15N into animal feed, but is very expensive, labor intensive and time consuming. It is however particularly relevant when the organic N fraction is investigated. More frequently, authors labelled the NH4+-N pool of a slurry by adding a small amount of highly enriched NH4+-N. Moal et al conducted a preliminary study that demonstrated that the added N behaves as the endogenous NH4+ initially present in the slurry. This abstract describes field and laboratory 15N balance studies conducted to determine the fate of labelled ammonium sulphate into a pig slurry.L'utilisation de l'isotope stable 15N est largement répandue pour l'étude du devenir de l'azote - dans le système sol-plante - des fertilisants chimiques. Peu d'études ont été conduites pour l'étude du devenir de l'azote des lisiers à l'aide de l'outil isotopique. Ce résumé illustre différentes applications du traçage isotopique 15N pour l'étude du devenir de l'azote des lisiers, à la fois des émissions d'ammoniac après épandage et des processus de nitrification dénitrification