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Modeling Ammonia Volatilization from Surface-Applied Swine Effluent

Department of Plant and Soil Sciences, Oklahoma State University, Stillwater, OK 74078

View larger version (38K): [in a new window]   Fig. 1. Comparison of predicted average rate of ammonia volatilization loss with field data measured in different seasons. Symbols represent measured data of different replicates, and solid lines are simulation results.

View larger version (44K): [in a new window]   Fig. 2. Comparison of predicted cumulative ammonia volatilization loss with field data measured in different seasons. Symbols represent measured data of different replicates, and solid lines are simulation results.

View larger version (40K): [in a new window]   Fig. 3. Sensitivity of cumulative ammonia volatilization loss to soil texture, soil pH, air temperature, and wind speed. Time started from the beginning of simulated irrigation events.

View larger version (25K): [in a new window]   Fig. 4. Comparison of simulated cumulative ammonia volatilization loss from swine effluent applied to the soil surface on 28 May of 1998, 1999, and 2000. Hourly average Mesonet weather data were used in the simulations.