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Related Experiment Videos

Diuron in surface runoff and tile drainage from two grass-seed fields.

David E Rupp1, R Edward Peachey, Kristina L Warren

  • 1Department of Bioengineering, Oregon State University, Corvallis, OR 97331, USA. david.rupp@lifetime.oregonstate.edu

Journal of Environmental Quality
|January 7, 2006
PubMed
Summary

Herbicide diuron [3-(3,4-dichlorophenyl)-1,1-dimethyl urea] in cool-season grass-seed fields can enter surface waters. Losses were primarily through surface runoff, with concentrations decreasing over the season.

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Area of Science:

  • Environmental Chemistry
  • Agricultural Science
  • Ecotoxicology

Background:

  • Cool-season grass-seed production in Mediterranean climates often involves herbicide application.
  • Surface waters can be exposed to high concentrations of diuron during initial crop growth stages.

Purpose of the Study:

  • To quantify diuron transport in surface runoff and tile drainage from agricultural fields.
  • To understand the dissipation patterns of diuron in the environment post-application.

Main Methods:

  • Monitoring diuron concentrations in surface runoff and tile drainage over one wet season.
  • Utilizing a first-order decay model to describe diuron depletion.

Main Results:

  • Initial diuron concentrations in surface runoff were high, decreasing significantly by season's end.

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  • Diuron concentrations in tile drains were substantially lower than in surface runoff.
  • Total diuron loss via surface runoff ranged from 1.3 to 3% of the applied amount.

    • Conclusions:

    • Surface runoff is the primary pathway for diuron loss from grass-seed fields.
    • Diuron concentrations in runoff decrease over the wet season.
    • Cumulative rainfall can be a useful predictor of diuron depletion in runoff when data is limited.