SYMPOSIA PAPER Published: 01 November 2022

Standardizing Spray Droplet Size Distributions


An increasing number of companies and institutions have facilities that allow for the evaluation of droplet size associated with spray application from agrochemical nozzles. In response to the newly launched Council of Producers and Distributors of Agrotechnology (CPDA) Application Enhancement Program (AEP), there is an immediate need for a tool that will allow data generated from these differing sources to be standardized for equitable comparison and representation to ensure the program's successful implementation. This work adapts and integrates several existing resources to serve that purpose. Standard reference nozzles, as well as nozzle and pressure combinations recommended by CPDA's AEP, were evaluated for droplet size using multiple instrumentation types and measurement methods. The collected data were standardized using an established baseline reference nozzle dataset. The adjusted data were compared to baseline test nozzle data verifying the recommended method. While this method does allow for droplet size data developed from varying sources and measurement protocols to be aligned for equalized comparisons, it does not replace the need to meet a minimum standard set of testing protocols. The developed resource allows droplet size data, regardless of their source, to be appropriately normalized and used in this industry-leading program.

Author Information

Fritz, Bradley, K.
Aerial Application Technology Research Unit, USDA ARS, College Station, TX, US
Sun, J., Susan
Croda Inc., New Castle, DE, US
Kruger, Greg
University of Nebraska-Lincoln, North Platte, NE, US
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Pages: 24–45
DOI: 10.1520/STP164120210077
ISBN-EB: 978-0-8031-7730-7
ISBN-13: 978-0-8031-7729-1