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United States Department of Agriculture

Agricultural Research Service

Title: Effect of Drift Control Agents on Spray Droplet Size

Authors
item Holliday Iii, Thomas
item Hanks, James
item Wills, Gene - DELTA RES. & EXT. CENTER

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: October 20, 1998
Publication Date: N/A

Technical Abstract: Spray droplet size was determined for six experimental drift retardant adjuvants using a Malvern 2600 Lc laser particle analyzer. Adjuvant formulations were evaluated with a single nozzle over a range of pressures from 138 to 483 kPa, with four nozzle types, and after each of eight passes through a centrifugal pump. As pressure increased, volume median diamter (VMD) decreased and percent of spray volume in droplets <105 microns increased with all solutions. HM9745 produced a droplet spectrum similar to water; HM9622-A and HM9733 slightly reduced the percentage of spray volume in droplets <105 microns; and significant reductions in the percentage of spray volume in droplets <105 microns were obtained with HM9675, HM9717, and HM9718. The three TeeJet nozzles produced similar trends in droplet spectrum over a range of pressures from 138 to 413 kPa, whereas the TurboDrop nozzle required much higher pressure to produce a spray pattern. Percentage of spray volume in droplets <105 microns with the TeeJet nozzle was greatest with the XR 110015 VS, the brass 110015 produced slightly lower percentage, and the TT 110015 produced significantly lower percentages. The TurboDrop produced lower percentage <105 microns, but also produced significantly higher VMD's. Each pass through a centrifugal pump decreased the effectiveness of all adjuvants in reducing the percentage of spray volume in droplets <105 microns.

Last Modified: 9/10/2014
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