Preface

This paper is part of the Special Issue entitled "Gasesous emissions from Agricultural Systems" , Guest Edited by Dr Tom Misselbrook, Dr. José Martinez and Dr. Jan Huijsmans. It was issue of the Conference RAMIRAN 2004. / Co-édition de ce numéro spécial de la revue Biosystems Engineering sur le thème "Emissions gazeuses des systèmes agricoles" issu de la Conférence RAMIRAN 2004.