Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 7 2 2010 10.5194/bg-7-521-2010 http://www.biogeosciences.net/7/521/2010/ http://www.biogeosciences.net/7/521/2010/bg-7-521-2010.html http://www.biogeosciences.net/7/521/2010/bg-7-521-2010.pdf 521 536 2010-02-08 The annual ammonia budget of fertilised cut grassland – Part 1: Micrometeorological flux measurements and emissions after slurry application C. Spirig christoph.spirig@meteoswiss.ch C. R. Flechard C. Ammann A. Neftel Agroscope Reckenholz-Tänikon ART, Swiss Federal Research Station, Zürich, Switzerland Institut National de Recherches Agronomiques (INRA), Soils, Agro- and Hydro-Systems (SAS), Rennes Cedex, France now at: MeteoSwiss, Federal Office of Meteorology and Climatology, Zürich, Switzerland Two commercial ammonia (NH₃) analysers were customised to allow continuous measurements of vertical concentration gradients. 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