Slide Presentation

TITLE    (click title to view slides)

AUTHOR
Eric P. Prostko, Extension Weed Specialist
Paul E. Sumner, Extension Ag-Engineer
The University of Georgia

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TABLE OF CONTENTS
  1. Water Volume, Tractor Speed, and Nozzle Type Effects on Spray Coverage
  2. Factors That Influence Postemergence Herbicide Performance
  3. Current Application Trends
  4. U.S. Acres Planted to Herbicide Resistant Varieties
  5. TeeJet Nozzle Selection Guide
  6. Delavan Nozzle Selection Guide
  7. Experiment
  8. Examples of the nozzles used in these tests
  9. RESULTS
  10. Nozzle Type and GPA Effects - I 3.5 MPH Tractor Speed
  11. Nozzle Type and GPA Effects - II 5.0 MPH Tractor Speed
  12. Nozzle Type and GPA Effects - III 7.0 MPH Tractor Speed
  13. Comparision
  14. Summary
  15. Why is this important?
  16. Peanut Herbicides (POST)
  17. UGA Weed Science



SLIDE CONTENTS
  1. Water Volume, Tractor Speed, and Nozzle Type Effects on Spray Coverage Eric P. Prostko, Extension Weed Specialist Paul E. Sumner, Extension Ag-Engineer The University of Georgia Peanut Achievement Club - 2007
  2. Factors That Influence Postemergence Herbicide Performance weed size rate environment moisture temperature humidity application water volume (GPA) tractor speed nozzle type
  3. Current Application Trends low water volumes 10 GPA or less faster tractor speeds nozzle types Air Induction (AI) Turbo-Jet (TJ) Hollow-Cone (HC) Why?? RR crops More acres Labor issues
  4. U.S. Acres Planted to Herbicide Resistant Varieties Source: NASS Includes stacked
  5. 3.5, 5.0, 7.0 MPH 10, 15, 20 GPA XR-Flat Fan (XR-FF) and Hollow Cone (HC) Nozzles 9 replications Kromekote water sensitive cards
  6. Flat Fan Hollow Cone (Whirl-Jet)
  7. RESULTS
  8. Nozzle Type and GPA Effects - I 3.5 MPH Tractor Speed LSD 0.10 = 3
  9. Nozzle Type and GPA Effects - II 5.0 MPH Tractor Speed LSD 0.10 = 3
  10. Nozzle Type and GPA Effects - III 7.0 MPH Tractor Speed LSD 0.10 = 3
  11. 10 GPA - 7 MPH HC (12% coverage) 20 GPA 3.5 MPH XR (FF) (45% coverage)
  12. Summary 3-way interaction between tractor speed, GPA, and nozzle type HC nozzles provided less coverage than XR-FF nozzles Tractor speed FF and 20 GPA = 3.5 mph > 5.0 mph = 7.0 mph HC and 10 GPA = 3.5 mph > 5.0 mph = 7.0 mph HC and 15 GPA = 3.5 mph > 7.0 mph increases in GPA improved coverage 20 GPA > 15 GPA > 10 GPA best coverage (45%) 3.5 MPH/20 GPA/XR-FF least coverage (12%) 7.0 MPH/10 GPA/HC
  13. Why is this important? Application techniques for glyphosate (systemic) are not adequate for other types of herbicides such as paraquat (contact)!
  14. Peanut Herbicides (POST)
  15. www.gaweed.com