Prediction of Overland Phosphorus Transport Using a Phosphorus Enrichment Ratio

by A. N. Rousseau, Cornell Univ, United States,
W. T. Dickinson, Cornell Univ, United States,
R. P. Rudra, Cornell Univ, United States,
S. I. Saul, Cornell Univ, United States,

Document Type: Proceeding Paper

Part of: National Water Conference


The Guelph model to evaluate the effects of Agricultural Management Systems on Erosion, Sedimentation, and Phosphorus yield (GAMESP) of Rousseau et al. was used to calibrate the phosphorus enrichment equation proposed by both R.G. Menzel and A.N. Sharpley. The slope of the phosphorus enrichment equation was assumed equal to -0.20. The intercept of the equation was calibrated, using a field-discretized agricultural watershed of Southwestern Ontario, to predict the distribution of seasonal overland phosphorus transport. For estimated downstream loads of sediment and phosphorus of 163 t and 257 kg respectively, the calibrated intercept for this site-specific investigation was 2.20. The results of this calibration revealed that 88 percent of the downstream phosphorus yield emanated from only 22 percent of the watershed area, and the average phosphorus enrichment ratio for the watershed was 2.4.

Subject Headings: Phosphorus | Nutrient pollution | Watersheds | Calibration | Sediment | Agricultural wastes | Water supply systems | Ontario | Canada

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