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Related Experiment Videos

Predicting dissolved phosphorus in runoff from manured field plots.

P A Vadas1, B E Haggard, W J Gburek

  • 1USDA-ARS, Pasture Systems and Watershed Management Research Unit, Building 3702, Curtin Road, University Park, PA 16802-3702, USA. Peter.Vadas@ars.usda.gov

Journal of Environmental Quality
|July 7, 2005
PubMed
Summary

This study improves models predicting phosphorus (P) runoff from manure-applied soils. Updated models using P distribution fractions accurately predict P transport, addressing previous underestimations in field studies.

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Area of Science:

  • Environmental Science
  • Agricultural Science
  • Soil Science
  • Water Quality

Background:

  • Dissolved inorganic phosphorus (P) transport in agricultural runoff is a significant environmental issue.
  • Existing models often fail to accurately simulate P runoff specifically from surface-applied manures.
  • Predicting P release from manure during rainfall events is crucial for water quality management.

Purpose of the Study:

  • To test and update a previously proposed model for predicting manure P in runoff.
  • To improve the accuracy of P runoff predictions, particularly for field plot conditions.
  • To develop and validate a new method for distributing P release into runoff and infiltration.

Main Methods:

  • Utilized field-plot and soil-box data from manure runoff studies.

Related Experiment Videos

  • Updated a predictive model by incorporating water-to-manure ratio data for P release during water extractions.
  • Developed and implemented 'P distribution fractions' derived from manure water extraction data to replace traditional runoff-to-rain ratios.

    • Main Results:

    • The initial updated model accurately predicted P runoff in soil boxes but underpredicted it in field plots.
    • The revised model, incorporating P distribution fractions, accurately predicted P runoff for both soil boxes and field plots.
    • Relationships were identified between measured runoff-to-rain ratios, P distribution fractions, and prediction errors.

    Conclusions:

    • The developed P distribution fractions significantly improve the accuracy of manure P runoff models.
    • The refined model provides a more reliable tool for assessing P transport from agricultural soils with surface-applied manures.
    • Future research should focus on validating the model at larger scales (field/watershed) and longer timeframes.