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ARS Home » Research » Publications at this Location » Publication #99610
Title: EFFECT OF DIFFERENT NOZZLE TYPES AND SPRAY PRESSURES ON DROPLET SIZE AND EFFICACY OF ROUNDUP ULTRA.

Author
item JONES, E. - DELTA RES. & EXT. CENTER
item Hanks, James
item WILLS, G. - DELTA RES. & EXT. CENTER
item MILLS, J. - MONSANTO CO.

Submitted to: Proceedings of Southern Weed Science Society
Publication Type: Abstract Only
Publication Acceptance Date: 1/24/1999
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Studies were conducted using Roundup Ultra herbicide with six different types of spray nozzles to find which nozzles were best for reducing herbicide drift while maintaining good weed control. Spray droplet size was determined with a Malvern 2600 Lc laser particle analyzer. Weed control was determined in field tests with herbicide treatments on four weed plant species. Weed control was similar with all six spray nozzles for each weedy species. Individual spray nozzles produced different levels of fine (<105 microns) droplets which are more prone to drift. The percent volume of spray droplets larger than 105 microns for each spray nozzle were: Turbo Drop - 97%; Air Induction - 94%; Turbo Flood - 92%; Turbo - 82%; Drift Guard - 67%; and Extended Range - 51%. Results of this study indicate that the volume of driftable fine droplets of Roundup Ultra can be reduced by altering the design of the applicator spray nozzles without appreciably affecting the percent weed control of the herbicide.