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Drift-Reducing Nozzles

Drift-Reducing Nozzles. Rich Affeldt Extension Crop Scientist Jefferson County Acknowledgment: Dr. Tom Wolf, Agri-Food Canada Dr. Bob Wolf, Kansas State University Mark Mellbye, OSU Extension. Quick review: Nozzles Are Labeled by Spray Angle and Output. An 8002 is? 80 0 And?

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Drift-Reducing Nozzles

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  1. Drift-Reducing Nozzles Rich Affeldt Extension Crop Scientist Jefferson County Acknowledgment:Dr. Tom Wolf, Agri-Food Canada Dr. Bob Wolf, Kansas State University Mark Mellbye, OSU Extension

  2. Quick review: Nozzles Are Labeled by Spray Angle and Output • An 8002 is? • 800 • And? • 0.2 gpm at 40 psi.

  3. Choosing nozzles is usually a balance between coverage and drift potential.

  4. Nozzle Types

  5. Conventional Flat Fan (XR) • Proven • Wide pressure range • Potential for drift

  6. Drift Reduction – Pre-Orifice TeeJet DGDrift Guard Turbo TeeJet Turbo FloodJet

  7. Drift Guard (DG) • Pre-orifice chamber reduces internal nozzle pressure • 30-60 psi creates similar amount of fines as normal flat fan at 15-25 psi • Higher pressure prevents tailing-off at ends of boom Flat Fan Drift Guard

  8. Turbo TeeJet (TT) • Pre orifice turbulence chamber • Wide angle, flood-type, 15-90 psi • Medium to coarse droplets

  9. Turbo TeeJet (TT)

  10. Air Induced (Venturi-type) • Venturi chamber mixes air with spray solution • Coarse droplets with few fines • Not like conventional nozzles at low pressure

  11. Air Induced (Venturi-type) • Be aware of: • Differences in pressure operating range • Ease of cleaning • Ability to fit into existing nozzle caps • Eight brands available in North America

  12. TeeJet Air Induction • Other similar designs • Stainless steel tip • Available even fan • 40-100 psi • Best from 60-80 psi • Requires special cap

  13. Greenleaf TurboDrop • Most proven • 30-150 psi • Best from 60-80 • TurboDrop XL • Lower pressure version

  14. Greenleaf AirMix • Relatively new • Lower pressure than most venturi-type • 15-90 psi • Best from 25-60 psi

  15. New release in 2007: • XR outlet with venturi air aspirator design • More compact than AI style • 2-piece with removable pre-orifice AI XR TeeJet

  16. Next Generation Air Induction Nozzles: • More compact • Larger drops • Operates at lower pressures • Percentage of fines do not increase with pressure Turbo Injection - TTI

  17. Next Generation Air Induction Nozzles: • More consistent droplet • All-in-one cap and screen • Wide angle with 20 degree incline • Aim forward or backword Guardian

  18. Volume Median Diameter

  19. Nozzles-Recommended Use 20-30 PSI flat spray chamber 30-40 PSI air induced 50-80 PSI

  20. 40 psi XR nozzle 70 psi AI nozzle

  21. Comparison with Greenleaf venturi type About 2% % spray < 100 microns

  22. Comparison with Greenleaf venturi type % spray < 100 microns 2%

  23. Nozzle Summary 1. Conventional (XR) Proven, wide pressure range, drift prone 2. Pre-orifice (DG, TT) Proven, higher pressures, 50% less drift 3. Low-Pressure Air Induced (“venturi”) Reasonable press., more water, 50-70% less drift 4. High Pressure Air Induced (“venturi”) Higher press, more water, 70-95% less drift

  24. Twin Jet Nozzles • Often marketed for “better canopy penetration” • Research at KSU in soybean showed less canopy penetration than a single orifice nozzle

  25. Calibration!!!!The next phase! Ensuring that the spray droplet spectrum is what it is supposed to be to maximize efficacy while minimizing drift! A new concept for applicators!

  26. Volume Median Diameter

  27. >150 Fungicides/Insecticides 151-250 251-350 351-450 Herbicides 451-550 >551 Source: Crop Life – July 2002

  28. Droplet Selection/Calibration:

  29. Droplet Spectra Classification*

  30. Greenleaf Droplet chart: www.turbodrop.com

  31. Volume Median Diameter (VMD) % less than 210 Microns 15 29 23 14 26 19 14 22 10 29 15 17 51 35 22 13 30 37 36 45 40 psi 40 psi 40 psi 70 psi Percent fines Bob Klein, U of Nebraska

  32. On the Internet • http://agbiopubs.sdstate.edu/articles/FS919.pdf • Summary of drift reducing nozzles • www.bae.ksu.edu/faculty/wolf/ • A leading expert on nozzle technology • http://www.teejet.com • http://www.turbodrop.com/ • http://aandlsupply.com • Regional supplier of GreenLeaf nozzles

  33. VariTarget: • Speed variations from 2-20 MPH • Application rates of 5-40 GPA • Variable area pre orifice • Variable area spray orifice • Optimize spray droplet size • Maintain efficacy and minimize drift

  34. www.spraytarget.com

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