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Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction
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Development of the spray drift task force database for aerial applications.

Andrew J Hewitt1, David R Johnson, John D Fish

  • 1Stewart Agricultural Research Services, Macon, Missouri 63552, USA. ahewitt@marktwain.net

Environmental Toxicology and Chemistry
|March 7, 2002
PubMed
Summary

The Spray Drift Task Force (SDTF) database models agricultural chemical exposure. Key factors influencing off-target spray deposition include droplet size, release position, and wind conditions.

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Area of Science:

  • Agricultural Science
  • Environmental Science
  • Risk Assessment Modeling

Background:

  • The development of the Spray Drift Task Force (SDTF) database is crucial for agricultural chemical exposure risk assessment.
  • This series details the creation of a generic database applicable to aerial application methods.
  • The database assumes active ingredient rate does not influence physical spray drift.

Purpose of the Study:

  • To describe the development of the SDTF database.
  • To apply the database for estimating spray movement after aerial application.
  • To identify key variables affecting off-target spray deposition.

Main Methods:

  • Development of a large, generic database for spray drift modeling.
  • Utilizing the database to estimate spray movement following aerial application.
  • Analysis of components influencing spray deposition.

Main Results:

  • The database aligns with open literature field trials.
  • Major variables affecting off-target deposition are droplet size, spray release position (boom height/length), and wind speed/direction.
  • Secondary parameters influencing drift are also identified.

Conclusions:

  • The SDTF database provides a valuable tool for agricultural chemical exposure modeling.
  • Understanding key variables is essential for mitigating off-target spray deposition.
  • Further research can explore secondary parameters impacting spray drift.