ABSTRACTafter nitrification of the ammonium nitrogen (NH 4 -N) present, and emission of NH 3 (European Centre for Much animal manure is being applied to small land areas close to Ecotoxicology and Toxicology of Chemicals, 1994), CH 4animal confinements, resulting in environmental degradation. This paper reports a study on the emissions of ammonia (NH 3 ), methane (Chadwick and Pain, 1997) et al., 1991, 1996). However, TAN applied). Methane emission was highest (39.6 g C hathe magnitude of these direct effects and interactions immediately after application, as dissolved CH 4 was released from the slurry. Emissions then continued at a low rate for approximately 7is not known with certainty.

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