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Mobility of dimethoate residues from spring broccoli field.

George F Antonious1, Zachary M Ray, Louie Rivers

  • 1Kentucky State University, Land Grant Program, Department of Plant and Soil Science, Frankfort, KY 40601-2355, USA. george.antonious@kysu.edu

Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
|December 13, 2006
PubMed
Summary
This summary is machine-generated.

This study investigated dimethoate insecticide movement in soil. Soil amendments with organic matter did not significantly alter dimethoate concentrations in the vadose zone, despite increased water infiltration.

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Area of Science:

  • Environmental Chemistry
  • Agronomy
  • Soil Science

Background:

  • Dimethoate is a widely used systemic insecticide with hydrophilic properties, indicating potential for off-site movement.
  • Understanding dimethoate's fate in soil and water is crucial for assessing environmental risks, especially in agricultural settings.

Purpose of the Study:

  • To evaluate the impact of soil amendments (municipal sewage sludge, yard waste compost) on the off-site movement of dimethoate residues.
  • To determine dimethoate dissipation patterns in broccoli foliage, soil, and water under different soil management practices.

Main Methods:

  • Foliar application of dimethoate on broccoli grown in Lowell silty loam soil amended with sewage sludge, yard waste compost, or no mulch.
  • Monitoring of dimethoate residues in broccoli heads and leaves, topsoil, runoff water, and vadose zone infiltration water.

Main Results:

  • Dimethoate residues on broccoli dissipated rapidly, falling below the maximum residue limit within 10-14 days, with half-lives of 3.9-5.7 days.
  • Initial dimethoate soil deposits varied, with the no-mulch treatment showing the highest concentration (134.5 ng g⁻¹).
  • Despite increased water infiltration in the yard waste compost treatment, dimethoate concentrations in the vadose zone did not differ significantly across treatments.

Conclusions:

  • Soil amendments with organic matter did not significantly affect the off-site movement of dimethoate into the vadose zone.
  • Rapid dissipation of dimethoate on broccoli foliage suggests limited long-term residue presence on the crop.
  • Further research may be needed to fully understand the long-term fate and transport of dimethoate in different soil types and environmental conditions.