Validation of Gleams Model for Poultry Litter Management

摘要

The GLEAMS model was applied to represent 6 fertilizer and broiler littermanagement practices on Coastal bermudagrass with multiple cuttings for hay at Watkinsville, Georgia. Observed data from a 7 year study were used to validate GLEAMS with comparisons of runoff volumes, runoff nitrogen, NO3-N leached, forage yield, and nitrogen yield. Simulated runoff volumes and runoff nitrogen losses compared well observed values for the record period. NO3-N leached and maximum monthly weighted concentrations were compared with good representation of the timing of peaks for all treatments. The model over-estimated the mass of NO3-N