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Comparison of Spray Droplet Characteristics for Nozzles Used for Agronomic Weed Control

Comparison of Spray Droplet Characteristics for Nozzles Used for Agronomic Weed Control. Robert Wolf Cory Friedli and Brian Lauer Biological and Agricultural Engineering Dept. XR, TR Turbo Flood Turbo TeeJet Air Mix AI XR GuardianAir AI Ultra Low Drift Turbo Drop TTI.

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Comparison of Spray Droplet Characteristics for Nozzles Used for Agronomic Weed Control

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  1. Comparison of Spray Droplet Characteristics for Nozzles Used for Agronomic Weed Control Robert Wolf Cory Friedli and Brian Lauer Biological and Agricultural Engineering Dept.

  2. XR, TR Turbo Flood Turbo TeeJet Air Mix AI XR GuardianAir AI Ultra Low Drift Turbo Drop TTI Nozzle Efficacy/Drift Slope 1980 30 years Reducing Spray Drift Extended Range Nozzle development timeline Chamber Design Venturi Design - II Venturi Design - I Efficacy 2009

  3. New 2008 Test Nozzles! Air Mix & TDHSTF- Greenleaf Turbo TwinJet AI XR TeeJet GuardianAir - Hypro

  4. Objective The objective of this study was to compare droplet spectra characteristics for nozzle types used to apply postemergence herbicides.

  5. Materials and Methods cont.: 24 ft. spray bar 7.5 GPA @ 10 MPH 0.24 GPM / nozzle Nozzle Spacing: 20 in. Boom Height: 20 in.

  6. 1. XR Flat-fan (XR) 5. AIC Venturi Flat-fan 6. TurboDrop High Speed Twin-fan 7. Ultra Lo Drift (ULD) 8. TTI Venturi Flat-fan Materials and Methods cont.: 28 PSI 2. DR Flat-fan DR 3. Turbo Flat-fan (TT) 4. Turbo Twin Flat-fan (TTJ60) 40 PSI 70 PSI 9. BFS Venturi Flat-fan 10. AIXR Venturi Flat-fan (AIXR) 11. Air Mix Venturi Flat-fan (AM) 12. GuardianAir Venturi Flat-fan (GA) 40 PSI

  7. Results Discussion

  8. DropletScan used to analyze droplets Water Sensitive Paper Portable computer Color Scanner Color Printer • Droplet scan software was used for droplet characteristics • Volume Median Diameter, Percent Area Coverage, Deposition • Statistical analysis with SAS

  9. Droplet Size a b d bc bc cd d cd d c f ef

  10. Coverge a a b cd cd bc cde de cd bc c f

  11. Deposition b b b b b b b b b b b b

  12. Findings • Statistical differences were found for all droplet characteristics measured. • TTI - largest droplets, with lowest coverage and deposition. • XR - smallest droplets, with most coverage and deposition. • ULD – middle on droplet size, 2nd best coverage and deposition. • Venturi design II group as an average had smaller droplets, better coverage and deposition than the venturi design I group.

  13. Conclusions: • The findings support that the use of nozzle types producing smaller droplets tend to have more coverage and deposition than those producing larger droplets. • Data also supports that the newer designs in venturi nozzles will provide more coverage and deposition than the older venturi nozzle designs.

  14. Thanks

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