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Calibrating Spray Equipment

Calibrating Spray Equipment. Page 69. Why Calibrate. Better Pest Control Environmental and human safety Effective use of time Inadequate control = more treatments Cost/Benefit ratio Lack of calibration = improper mixing 1 gallon of Tordon per 100 gallons of water Will revisit.

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Calibrating Spray Equipment

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  1. Calibrating Spray Equipment Page 69

  2. Why Calibrate • Better Pest Control • Environmental and human safety • Effective use of time • Inadequate control = more treatments • Cost/Benefit ratio • Lack of calibration = improper mixing • 1 gallon of Tordon per 100 gallons of water • Will revisit

  3. What’s An Application Rate • Gallons of liquid applied per acre • GPA • Water and pesticide mixed • a.k.a. • Sprayer volume • Sprayer output • Need to know GPA for mixing

  4. Variables Affecting GPA • Ground Speed (MPH) • Speed up = less liquid = lower application rate • Slow down = more liquid = increased application rate Consistency

  5. Variables Affecting GPA • Nozzle Flow Rate • GPM • Depends on Orifice size = 0.50 GPM = 0.20 GPM

  6. Variables Affecting GPA • Pressure • 4x pressure to double GPA • Increased pressure = smaller droplets Drift For Minor Adjustments Only

  7. Variables Affecting GPA • Spray Width or Spacing • 100% swath overlapping doubles output

  8. Variables Affecting GPA • Nozzle Wear • Worn tips = • Over application • Erratic patterns

  9. Figuring Out GPA • Label requirements More GPA = More Coverage

  10. Figuring Out GPA • Label requirements • Determine Your Field Speed • Know it to maintain it! 200 Feet in 27 seconds 20027 X 0.682 = 5 MPH Buy a speed sensor

  11. Figuring Out GPA • Label requirements • Determine Your Field Speed • Collect from each nozzle • - Find GPM 64 ounces Ounces .128 oz. Per gallon = 0.5 Gallons = Gallons

  12. Figuring Out GPA • Label requirements • Determine Your Field Speed • Collect from each nozzle • Want output of one nozzle • Simply plug in the numbers

  13. GPA is given or required!Need GPM for each nozzle! Rearrange formula

  14. How Much To Add To The Tank • Acres that can be sprayed with a given volume in the tank • GPA • Labeled Rate

  15. How Much To Add To The Tank • Acres that can be sprayed with a given volume in the tank VolumeGPA = Acres 500 gal.25 GPA = 20 Acres 20 Acres x 25 GPA = 500 gallons

  16. How Much To Add To The Tank Acres x labeled rate per acre • Acres that can be sprayed with a given volume in the tank • GPA • Labeled Rate Gallons? 20 acres x 3 pints/acre = 60 pints 60 pints  8 pints/gal. = 7.5 gal.

  17. 1 gallon of Tordon per 100 gallons of water • - Sprayer applied 50 GPA • - Could spray 2 acres with 100 gallons • 100 gallons  50 GPA = 2 acres • - Rate was 1 quart per acre • - Only needed to add 2 quarts per 100 gallons • 2 acres x 1 quart per acre = 2 quarts per 100 gallons • - Over applied by 2x ($40 per acre)

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