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Updated: Feb 16, 2026

Measuring Phosphorus Release in Laboratory Microcosms for Water Quality Assessment
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Assessing Coastal Plain Risk Indices for Subsurface Phosphorus Loss.

Amy L Shober, Anthony R Buda, Kathryn C Turner

    Journal of Environmental Quality
    |January 3, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Phosphorus (P) Index evaluations need improvement for subsurface flow. Soil water extractable P (WEP) can effectively estimate P loss risk when direct data is limited.

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    Area of Science:

    • Environmental Science
    • Agricultural Science
    • Soil Science

    Background:

    • Phosphorus (P) Index evaluations are crucial for nutrient management in the U.S.
    • Current P Indices inadequately represent subsurface P loss in drained agroecosystems.
    • Subsurface flow is the primary P transport pathway in Atlantic Coastal Plain systems.

    Purpose of the Study:

    • To evaluate subsurface P risk routines of five P Indices.
    • To explore methods for assessing P loss via subsurface flow.
    • To identify reliable proxies for P loss when water quality data is scarce.

    Main Methods:

    • Assessed five P Indices using water quality and soil datasets from the Atlantic Coastal Plain.
    • Compared P Index risk scores with dissolved P loads in leachate and ditch drainage.
    • Investigated soil water extractable P (WEP) at seasonal high water table as a proxy for P loss.

    Main Results:

    • Subsurface P risk scores showed directional correctness and statistical significance with P loads, but data limitations existed.
    • WEP concentrations served as a realistic proxy for subsurface P losses in ditch drainage.
    • WEP associations with P risk ratings mirrored those from limited water quality data.

    Conclusions:

    • WEP is a valuable metric for assessing subsurface P risk when direct water quality data is unavailable.
    • Current P Indices require enhancement for subsurface flow representation.
    • Long-term monitoring and modeling are essential for robust P Index appraisals.