Spray Droplet Size Standard S-572. Robert E. Wolf Extension Specialist Application Technology. Biological and Agricultural Engineering. Efficacy and Drift Potential is Influenced by. Size of the Spray Droplets - Volume Median Diameter (VMD) Droplet Spectrum (Range - big to small).
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Robert E. Wolf
Extension Specialist Application Technology
Biological and Agricultural Engineering
Volume Median Diameter (VMD)
% Volume in droplets less than
200 microns in size
One micron (m) =1/25,000 inch
paper clip 850 (m)
staple 420 (m)
toothbrush bristle 300 (m)
sewing thread 150 (m)
human hair 100 (m)Comparison of Micron Sizes for Various Items: (approximate values)
1/2 of spray volume = larger droplets
High Relative Humidity
Low Relative Humidity
Match the crop protection product to the target
Adhere to label guidelines based on an industry standard
Buffer Zones or No Spray Zones
Example Reference Graph
very fine/ fine
coarse/ very coarse
very coarse/ extremely coarse
Drop Size (microns)
Cumulative Volume FractionEPA Requested Changes Coming!?!?
2000 -- ASAE Standard S572
*USDA ARS College Station, TX
Demonstrates Turbo Flat vs TurboDrop-5 MPH Wind
Where air is drawn into the nozzle cavity and exits with the fluid.
XR vs TurboDrop
Turbo Flat vs Turbo Drop