Submitted to: American Chemical Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: May 12, 2009
Publication Date: August 20, 2009
Citation: Spiehs, M.J., Woodbury, B.L., Eigenberg, R.A., Doran, B.E., Kohl, K.D. 2009. Ammonia Emissions From Feedlot Surface of Beef Deep-Bedded Monoslope Facilities. [abstract] In: Proceedings of 238th American Chemistry Society National Meeting, Aug. 16-20, 2009, Washington, DC. Abstract 62, p. 101. Technical Abstract: The objective of this study was to determine spatial and seasonal variation for ammonia emitted from the surface of beef deep-bedded monoslope facilities. Four pens (27.5 x 30.5 m) in two commercial beef deep-bedded monoslope facilities were studied. In each pen, ammonia was collected in acid traps at 56 locations using flux chambers with a surface area of 640 cm**2**. To obtain data at multiple time points during each season, samples were collected at 6-week intervals from March to December 2008. Time series data were collected on two separate days at time 0, 4, and 10 hrs to determine the length of time necessary to reach baseline ammonia emissions after cattle removal from the pen. There was no consistent spatial pattern of ammonia emissions. Ammonia emission rate decreased rapidly (< 4 hr) after cattle were removed from pens. Seasonal effects were observed with winter consistently lower than spring or summer.