Abstract
The GLEAMS (Groundwater Loading Effects of Agricultural Management System) (version 2.1) water quality model was used to predict nutrient (N and P) losses in surface and subsurface runoff, and their concentrations in soil layers, following application of two rates (9 and 18 t ha1) of poultry litter and a recommended rate of a commercial fertilizer on conventionally tilled corn plots at the Tennessee Valley Substation of the Alabama Agricultural Experiment Station. Model simulation results were compared with field data. The experiment included four replications for each of the three soil-amendment treatments. The GLEAMS simulation of soluble and sediment P losses in surface runoff and NO3-N concentrations in leachate and soil layers were not consistent with field data. Simulation of N-transformation effects on N losses in surface runoff did not agree with field data. The model simulated higher NH4-N than NO3-N losses in surface runoff, while field data showed the opposite. The model simulated low concentrations of P in leachate at a 1.0 m depth, while the observed data showed large variations.
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