Abstract
Abstract During a three week period, comparisons were made between different methods for measuring ammonia emissions following the spreading of cattle slurry on grassland. Micrometeorological and wind tunnel methods were compared, the former including a range of techniques for determining ammonia concentration in air. Agreement between the basic micrometeorological and wind tunnel methods was good, with a maximum difference of 25%. Technical problems with some of the novel techniques (Opsis method and Ferm tubes) limited the period during which a complete set of data was obtained. Nevertheless, the preliminary results reported in this paper indicate good agreement between these methods over a seven hour period and they deserve further investigation.
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