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Atmospheric Ammonia, Volatile Fatty Acids, and Other Odorants near Beef Feedlots

Research Centre, Agriculture and Agri-Food Canada, Box 3000, Lethbridge, Alberta, Canada T1J 4B1

View larger version (23K): [in a new window]   Fig. 1. Contribution of individual volatile fatty acid (VFA) compounds to total VFAs at three feedlots.

View larger version (28K): [in a new window]   Fig. 2. Average ammonia concentration at distances downwind of the (A) 12000- and 25000-head feedlots measured over two-day sampling durations at fixed tower locations, and (B) dispersion measured with a portable analyzer using a 5-min sample duration. Different symbols denote different sampling periods.

View larger version (30K): [in a new window]   Fig. 3. Diurnal variability in ammonia concentration and wind speed recorded 200 m downwind of a feedlot using an open-path laser on (A) 16 June at the 25000-head feedlot and (B) 28 June at the 12000-head feedlot.

View larger version (19K): [in a new window]   Fig. 4. Volatile fatty acid (VFA) concentration at distances downwind of the (A) 12000- and (B) 25000-head feedlots measured over two-day sampling periods (different symbols) at fixed tower locations.

View larger version (30K): [in a new window]   Fig. 5. Odor intensity (measured with an olfactometer) at distances downwind of the (A) 12000- and (B) 25000-head feedlots measured over 5-min sampling durations. Upwind value is represented at a distance of -50 m.

View larger version (17K): [in a new window]   Fig. 6. Relationship between ammonia concentration and ammonia deposition downwind of feedlots.

View larger version (17K): [in a new window]   Fig. 7. Decrease in ammonia dry deposition with distance from the 12000- and 25000-head feedlots. Upwind value is represented at a distance of -50 m. Only one sample period was used at the 25000-head feedlot (20 July to 3 August) while five (between 8 June and 20 July) were measured at the 12000-head feedlot.