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.

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