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• W54846834 abstract "Growing environmental concern led to increased public and scientific attention to nitrogen transfers from animal manure and slurry. Major environmental problems arise from the excessive use of nitrogen compounds. Amongst these are (i) acidification of forests and natural ecosystems through atmospheric deposition of ammonia (NH3), (ii) eutrophication of inland waters and coastal seas mainly by organic N and nitrates, (iii) contamination of groundwater by nitrates and (iv) a contribution to the global warming problem by nitrous oxide, N2O. Tracer methods using 15N stable isotope provide and excellent tool for studying such complex transfers during the different stages of animal slurry management including storage, treatment and land spreading. In this article, we present a brief review of isotopic tracer principles and history through a general description of terms, definitions and assumptions follow by the methodologies developed in our laboratory to label the ammoniacal nitrogen fraction of pig slurry using artificial 15N enrichment. The aim of our studies is to gather information concerning nitrogen pig slurry turnover and to focus on those processes, where major progress is made using the stable isotope 15N. Recent research findings are Presented. La connaissance du cycle de l'azote des déjections animales (lisiers) est un enjeu primordial au regard de préoccupations environnementales : accroissement de l'efficacité agronomique et/ou réduction des pollutions atmosphériques. Dans ce contexte, l'utilisation du traceur isotopique 15N permet de quantifier les différents mécanismes (assimilation et réorganisation, minéralisation, volatilisation, nitrification—dénitrification) et d'étudier les voies de transferts possibles. La technique développée consiste notamment à marquer la fraction azote ammoniacal du lisier par ajout direct de sulfate d'ammonium ou d'urée enrichis en 15N. Des essais en laboratoire illustrent les processus de nitrification - dénitrification ainsi que les transferts d'azote sous forme de protoxyde d'azote (N2O). Par ailleurs le suivi du devenir de l'azote après épandage de lisier au champ, permet d'établir un bilan sol—plante—air. Au travers de ces expériences, l'utilisation du marquage isotopique 15N de l'azote des déjections animales apparaît comme un outil de première importance." @default.
• W54846834 created "2016-06-24" @default.
• W54846834 creator A5034799977 @default.
• W54846834 date "2002-04-01" @default.
• W54846834 modified "2023-09-25" @default.
• W54846834 title "Gestion de l'azote en syst�me d'�levage d�velopp�. Enjeux scientifiques et environnementauxNitrogen management from intensive livestock production : scientific and environmental issues" @default.
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• W54846834 doi "https://doi.org/10.1016/s1240-1307(02)80134-0" @default.
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