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Spray Mix Adjuvants for Spray Drift Mitigation – Progress Report

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  031060,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13721) @2003
Authors:   I. W. Kirk
Keywords:   Aircraft, nozzles, drift, spray, droplet size, adjuvant, wind tunnel

Numerous drift reduction adjuvants and spray deposition aids are available to applicators of crop production and protection chemicals. Performance of many of the newly introduced drift control adjuvants has not been well documented for aerial application. Since there are no product labeling or efficacy regulations for these adjuvants, applicators must rely on experience or information in the technical literature for evaluating their performance. Several new drift control adjuvants were selected for atomization studies in a wind tunnel to document their performance as applicable to aerial application. Spray droplet size is the primary factor influencing spray drift that applicators can control. Atomization performance of spray adjuvants in a wind tunnel is closely related to their performance under field conditions. The adjuvants were mixed at the highest recommended label rate in a blank emulsifiable concentrate tank mix. Atomization data were collected with a laser spectrometer on the first and eighth passes through a gear pump. The eighth pass simulates any effect of shear breakdown and loss of effectiveness of the adjuvant from circulation in the spray tank during application. Most of the adjuvants move the droplet spectra classification from fine to medium. The most effective adjuvant moved the droplet spectra classification from fine to coarse. This performance information will aid aerial applicators in selecting drift reduction agents to meet the drift mitigation criterion for a given application.

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