Author: Laurent Philippot Affiliation: INRA, Dijon, France; Karl Ritz Affiliation: Department of Environmental Science and Technology, School of Applied Sciences, Cranfield, UK; Pascal Pandard Affiliation: INERIS, Verneuil en Halatte, France; Sara Hallin Affiliation: Department of Microbiology, Swedish University of Agricultural Sciences, Uppsala, Sweden; Fabrice Martin-Laurent Affiliation: INRA, Dijon, France; Welience Agro-Environment, Dijon Cedex, France