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Application of AnnAGNPS for Analysis of Nitrogen Loadings from a Small Agricultural Watershed in the Mississippi Delta

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Pp. 268-279 in Total Maximum Daily Load (TMDL) Environmental Regulations: Proceedings of the March 11-13, 2002 Conference, (Fort Worth, Texas, USA)  701P0102.(doi:10.13031/2013.7568)
Authors:   Y. Yuan, R. L. Bingner and R. A. Rebich
Keywords:   Water Quality Modeling, AnnAGNPS, Nitrogen, Loading

The Annualized Agricultural Nonpoint Source Pollution model (AnnAGNPS 2.0) has been developed as a technological tool that can be used to estimate watershed response to agricultural management practices. AnnAGNPS 2.0 has been used for the Deep Hollow watershed of the Mississippi Delta Management System Evaluation Area (MDMSEA) project for nitrogen loadings assessment. From sensitivity analyses, soil initial nitrogen concentration and crop nitrogen uptake had the most impact on the nitrogen loadings. AnnAGNPS 2.0 predicted results were compared with MDMSEA monitored data in order to test the prediction capability of the model. Test results show that AnnAGNPS provides a reasonable estimate (127%) of long term monthly and annual nitrogen loadings.

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