Contact: Dr. Bob Wolf, Extension Specialist Application Technology, Cooperative Extension Service, Kansas State University, 229 Seaton Hall, Manhattan, KS 66506   Email: rewolf@bae.ksu.edu

 Summary:  A field study was conducted to determine the influence on drift and deposition when adding spray drift control/deposition aids to tank mix solutions for fixed wing aerial applications.  The study involved using a drift collection tower to compare nozzle configurations, shear orientations, and pressures with and without a variety of drift control products.  A simultaneous canopy penetration study was conducted to evaluate the effect of the same tank mix materials and configurations on critical droplet characteristics, coverage, and deposition above and within the canopy.

 Preliminary reports indicate several differences occurred among products for reducing the downwind drift potential.  However, since that report, additional statistical analysis has provided a more critical view of the products performance at the different wind velocities.  A final analysis of the product comparisons will be given.  In addition, the deposition characteristics into a canopy for each product will be reported.  DropletScan software was used to analyze water sensitive paper on site for both the drift profile and the canopy deposition phases of this study.  Percent coverage, spray deposition rate (GPA), and droplet statistics such as Volume Median Diameter (D_V0.5 ), D_V0.1, and D_V0.9  were calculated for each drop card scanned. 

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