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The article presents a study which validates the soil and water assessment tool (SWAT) model for a small and spatially variable watershed for nitrate-nitrogen and total nitrogen (TN) export and for crop yield in eastern Canada. It notes that watershed simulation models can be used in assessing agricultural nonpoint-source pollution and for projects for environmental planning and improvement. Model and performance of SWAT was evaluated using coefficient of determination, Nash-Sutcliff efficiency (NSE) and percent bias (PBIAS) statistics. Results of the study show that the model has performed satisfactorily for stream flow, sediment and TN simulations.