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Nitrogen Cycling through Swine Production Systems

Ammonia, Dinitrogen, and Nitrous Oxide Emissions

^a Southern Piedmont Conservation Research Unit, JPCSNRCC, USDA-ARS, 1420 Experiment Station Road, Watkinsville, GA 30677
^b National Soil Tilth Laboratory, USDA-ARS, Ames, IA 50011
^c Laboratory of Applied Physical Chemistry, Faculty of Agricultural and Applied Biological Sciences, Ghent University, Coupure Links 653, Ghent B-9000, Belgium
^d 3864 Harts Mill Lane, NE, Atlanta, GA 30319

View larger version (25K): [in a new window]   Fig. 1. Ammonia concentration gradients with height during winter and summer and over lagoons of different ammonium concentrations: (a) North Carolina farrow-to-finish farm number 10 at 0800 h on 22 Jan. 1998, (b) North Carolina farrow-to-finish farm number 20 at 0800 h on 2 Feb. 1998, (c) North Carolina farrow-to-finish farm number 10 at 0800 on 5 Aug. 1997, and (d) North Carolina farrow-to-finish farm number 20 at 0800 on 7 Aug. 1997.

View larger version (42K): [in a new window]   Fig. 2. Ammonia flux density variation compared with wind speed and lagoon water temperature over one day in summer, 1997: (a) ammonia flux density vs. time, (b) wind speed over the lagoon vs. time, and (c) lagoon water temperature and rainfall vs. time.

View larger version (33K): [in a new window]   Fig. 3. Dinitrogen emissions from farrow-to-finish (FF) and farrow-to-wean (FW) production systems: (a) FF dinitrogen emissions vs. time, (b) FF surface and sludge temperatures vs. time, (c) FW dinitrogen emissions vs. time, and (d) FW surface and sludge temperatures vs. time. Error bars include measurement error and the unequal emissions spatial distribution of anaerobic decomposition in the lagoons.