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ARS Home » Northeast Area » University Park, Pennsylvania » Pasture Systems & Watershed Management Research » Research » Publications at this Location » Publication #102337
Title: PHOSPHORUS AND NITROGEN INDICES FOR SITE-SPECIFIC ENVIRONMENTAL RISK ASSESSMENT

Author
item Sharpley, Andrew
item Gburek, William
item Kleinman, Peter

Submitted to: "Aginfo 99" Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 8/14/1999
Publication Date: N/A
Citation: Sharpley, A.N., Gburek, W.J., Kleinman, P.J. 1999. Phosphorus and nitrogen indices for site-specific environmental risk assessment. "Aginfo 99" Conference Proceedings. p. 1-15.

Interpretive Summary:

Technical Abstract: Integrated approaches to derive BMPs that accommodate the spatial variation in phosphorus (P) and nitrogen (N) loss from agricultural land are examined using simple P and N indexing systems. We show that the primary flow pathways and critical source areas of P and N loss differ. We demonstrate that BMPs are more effective if narrowly targeted to watershed areas where the source and transport factors governing P and N loss coincide. Current legislation that focuses on source controls alone (e.g. soil P concentrations) may prove unnecessarily restrictive and may not achieve the desired reduction in nutrient loss from non-point sources.