Submitted to: Manure Management Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: 12/2/1999
Publication Date: N/A
Citation: Sharpley, A.N., Kleinman, P.J., Gburek, W.J., Folmar, G.J. 1999. Developing an integrated nutrient management approach for land applied manure at a watershed scale. Manure Management Conference Proceedings. p. 63-74. 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 nonpoint sources.