Ammonia emitted from manure can have detrimental affects on health, environmental quality, and fertilizer value. The objective of this study was to measure the potential for reduction in ammonia volatilization from swine manure by temperature control, stirring, addition of nitrogen binder (Yucca) or urease inhibitor (NBPT), segregation of urine from feces, and pH modification. Swine manure (TS 7.6-11.2%, TKN 3.3-6.2 g/L, NH4 +-N 1.0-3.3 g/L) was stored for 24, 48, 72, or 96 h in 2-L polyvinyl chloride vessels. The manure was analyzed to determine pre- and post-storage concentrations of total and volatile solids, total Kjeldahl nitrogen, and ammonium nitrogen. The accumulation of volatilized ammonia in the vessel headspace after storage was measured using Drager grab sample tubes. Headspace ammonia-N concentrations were reduced (P
