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Manure Phosphorus and Surface Water Protection IV: Assessment of the Risk of Agricultural P Delivery

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Addresses the assessment of potential for P delivery to surface waters resulting from the interaction of the source and transport factors addressed in Lessons II and III. The basic concepts and applications of P indexes as risk assessment tools are explored.

Overview

Manure Phosphorus (P) and Surface Water Protection IV: Assessment of Risk of Agricultural P Delivery

Charles Wortmann
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, USA

David Tarkalson
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, USA

Deana Namuth
Department of Agronomy and Horticulture, University of Nebraska-Lincoln, USA
(http://agronomy.unl.edu)
2005

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Overview:

Assessment of the potential for P delivery from agricultural land to surface waters is important in developing management plans for reducing P losses to surface waters. The assessment should enable producers and other agribusiness professionals to identify high risk areas, diagnose major causes of P loss, and evaluate the effectiveness of alternative management practices.

This lesson addresses the assessment of potential for P delivery to surface waters resulting from the interaction of the source and transport factors addressed in Lessons II and III. The basic concepts and applications of P indexes as risk assessment tools are explored.

Objectives:

Upon completing this lesson, a student should be able to:
1. Discuss the 'critical source area concept' relative to P delivery to surface waters.
2. Understand and be able to use two P indexes for risk assessment.
3. Determine the effects of different management practices on the estimated risk of P loss from agricultural land.

Development of this lesson was supported, in part, by a University of Nebraska Cooperative Extension grant. A contribution of the University of Nebraska Cooperative Extension, Journal Series 1074.
Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s).

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This project was supported in part by the National Research Initiative Competitive Grants CAP project 2011-68002-30029 from the USDA National Institute of Food and Agriculture, adminstered by the University of California-Davis and by the National Science Foundation (NSF), Division of Undergraduate Education, National SMETE Digital Library Program, Award #0938034, administered by the University of Nebraska. Any opinions, findings, conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the USDA or NSF.