GLEAMS simulation of groundwater nitrate-N from row crop and swine wastewater spray fields in the eastern Coastal Plain
1998
Stone, K.C. | Hunt, P.G. | Johnson, M.H. | Coffey, S.W.
Nonpoint source pollution of surface and groundwater resulting from agricultural management practices is a major water quality problem. This problem was assesse d on a demonstration watershed in the Cape Fear River Basin of North Carolina, d uring a five-year study. Groundwater was monitored in a row crop field (corn/whe at/soybean) and a swine waste spray field (Coastal bermuda grass). Groundwater n itrate-N concentrations averaged 6.5 mg/L in the row crop field. Nitrate-N conce ntrations in groundwater at the swine waste spray field exceeded 80 mg/L. Nitrat e-N concentrations were simulated in both fields with the GLEAMS model. The GLEA MS model simulated groundwater nitrate-N concentrations with mean residuals (sim ulated-observed) +/- 1.3 mg/L and +/- 19 mg/L, respectively, for the row crop an d the swine waste spray field. Groundwater nitrate-N concentrations have been re duced in the spray field by using improved management practices and the GLEAMS m odel simulated this nitrate-N concentration reduction. These simulation results show that the GLEAMS model can be used to predict nitrate-N loading of groundwat er of these agricultural management systems.
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