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Case Study: Occasional excessive ammonia emissions following dairy manure application to land: causes, impacts, and management recommendations
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Paper number 131620458, 2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131620458) @2013
Authors: Seungo Kim, Michael A Jahne, Shane W Rogers, Stefan J Grimberg, Thomas M Holsen
Keywords: ammonia cause impact AERMOD and recommendation
Abstract. Ammonia is being monitored and modeled following land application of dairy manure to determine the impacts of application method on its emission, transport, and deposition. Ammonia emission flux from manure applied fields and downwind concentrations are measured following conventional splash plate spreading, direct injection, and drag-hose application of liquid dairy manure. Conventional broadcast spreading has produced the greatest nitrogen emissions from both the field and lab soil experiments; exposure concentrations in excess of OSHA’s Permissible Exposure Limit (PEL) of 35 mg/m3 have been observed. On two instances, ammonia emissions flux exceeded 111 mg/m2/hr, the maximum emissions rate that our instrument could monitor. This equated to 3.6 times the average ammonia emissions flux of the remaining sampling events. Atmospheric ammonia concentrations on those dates reached 56 mg/m3, far exceeding OSHA’s PEL. Here, we report the causes of these excessive ammonia-N fluxes, potential impacts, and management recommendations to avoid high ammonia emissions events and preserve valuable nitrogen fertilizer.
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