DropletScan software and a flatbed scanner were used to analyze spray droplets collected on watersensitivepaper. Collections on watersensitive papers were made from a ground sprayer during infield herbicide efficacy trials. Ina separate procedure, watersensitive papers were used to collect downwind spray droplet deposits. The purpose of eachprocedure was to assess the ability of DropletScan. to measure the differences in spray droplet characteristics onwatersensitive paper. DropletScan. generates several droplet statistics including DV0.1, DV0.5, DV0.9, number of dropletsunder 200 microns per unit area, deposition/GPA, and percent area coverage. In each evaluation procedure an extended rangeflatfan nozzle was compared to an airinduction flatfan nozzle at different application volumes and pressures. Based onthe procedures used in this assessment, DropletScan. effectively measured differences in spray droplet characteristics forboth infield and downwind collections of spray droplets.
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Robert E. Wolf (2003) studied this question.