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Related Experiment Videos

Technical basis for quantifying phosphorus transport to surface and groundwaters.

J L Havlin1

  • 1Department of Soil Science, North Carolina State University, Raleigh 27695, USA. john_havlin@ncsu.edu <john_havlin@ncsu.edu>

Journal of Animal Science
|October 9, 2004
PubMed
Summary

Minimizing phosphorus (P) loss to water requires understanding P transport. This study outlines key P transport processes for developing practical assessment tools to reduce P runoff and leaching from agricultural lands.

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Change in soluble phosphorus in soils following fertilization is dependent on initial Mehlich-3 phosphorus.

Journal of environmental qualityยท2006
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Area of Science:

  • Environmental Science
  • Soil Science
  • Water Quality

Background:

  • Phosphorus (P) runoff into surface and groundwater is a significant environmental concern.
  • Effective management strategies require understanding P fate and transport mechanisms.
  • The USDA Natural Resources Conservation Service mandates P transport assessment tools for all states.

Purpose of the Study:

  • To describe the essential processes of phosphorus transport to surface and groundwaters.
  • To inform the development of practical methods for quantifying potential P loss.
  • To guide the creation of assessment tools for P transport.

Main Methods:

  • Mechanistic modeling approach to assess P loss.
  • Quantification of P adsorbed to eroding sediments.

Related Experiment Videos

  • Estimation of soluble P in runoff and leaching water.
  • Consideration of P losses specific to animal waste sources.

    • Main Results:

    • Identified four key P transport pathways: sediment-bound P, soluble P in runoff, soluble P in leachate, and source-specific P losses.
    • Highlighted the need to quantify adsorbed P in eroded soil and P concentration in runoff and drainage water.
    • Emphasized that P source (e.g., animal waste type) influences P solubility and loss.

    Conclusions:

    • A comprehensive P loss assessment tool must integrate sediment-bound P, soluble P, and source-specific factors.
    • Conservation practices' impact on reducing P loss must be incorporated.
    • Developed methods enable practitioners to estimate P loss and design effective management practices to minimize P transport to water bodies.