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Lesson 34: Agricultural Phosphorus Management: Protecting Production and
Water Quality-Andrew Sharpley

Intended Outcomes
The participants will

• Recognize the role of phosphorus (P) in controlling eutrophication.
• Identify what happens to P in soil when it is added via manure and fertilizer.
• Learn what practical farming measures can be used to minimize P loss.
• Target cost-beneficial best management practices, understand how water moves within a landscape, and learn where large sources of P exist.
• Review innovative products and measures being developed to help producers manage P.

Contents

    Note: Lesson 34 has undergone significant revisions by the
    author. This link will take you directly to the full lesson.

1. Introduction
2. Phosphorus and Water Quality Impairment
3. The Forms and Reactivity of P in Soil
4. The Evolution of Agriculture from P Sink to P Source
5. Processes and Pathways of P Transport in Agricultural Runoff
6. Forms and processes
7. Environmental Risk Assessment and P Management
8. Remedial Measures
9. Integrated Nutrient Management
10. Summary
11. Appendix A. Environmental Stewardship Assessment: Phosphorus Index
12. Appendix B. Regulatory Compliance Assessment: Phosphorus Management

Activities
The participants will

• Determine the risk associated with high soil P.