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“Spray Application Accuracy”

“Spray Application Accuracy”. Nozzle Selection. Points???. Why are you here???? Are you concerned with accuracy?. $$ go bye, bye Changing rates (< an ounce/acre) More foliar applied products (herbicides) More sophisticated equipment - $$$ Environmental impact (water and air) Inefficient

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“Spray Application Accuracy”

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  1. “Spray Application Accuracy” Nozzle Selection

  2. Points??? Why are you here????Are you concerned with accuracy? • $$ go bye, bye • Changing rates (< an ounce/acre) • More foliar applied products (herbicides) • More sophisticated equipment - $$$ • Environmental impact (water and air) • Inefficient • Variable rates • Site-specific

  3. Equipment cost today? How much do these machines cost?

  4. What about the cost of the nozzle?

  5. Regardless of the cost: • Without proper attention to the nozzle, you may end up with a misapplication

  6. Nozzles Control • Amount of spray applied • Uniformity of the spray • Coverage on the target • Amount of off-target drift

  7. Flat Spray Tips: Extended Range Flat-fan Drift Reduction Flat-fan Turbo Flood Flat-fan Turbo Flat-fan AI Flat-fan TurboDrop Cone Spray Tips: Raindrop Nozzle Types

  8. Selecting the proper nozzle Legal issues!!

  9. Nomenclature: Extended Range Trade Name (S,H,P,K,SS) Stainless Steel Insert Orifice VisiFlo Color Coding Fan angle and flow rate-orifice size Rated Pressure = 40 psi for most nozzle types 10 psi for turbo flood nozzles

  10. Typical nozzle numbering system

  11. Electronics/Rate Controllers • How does your system work when speed changes? • Is it pressure based? • What is the effect of going slower? • What is the effect of going faster?

  12. Typical nozzle numbering system

  13. Set up for Uniformity Goal is to put the material on evenly from nozzle to nozzle, end of boom to end of boom, and across the entire field. 20-inch spacing requires 17-19” above target for 50-60% overlap.

  14. Set Up For Uniformity • What is the first step? • Use label to select the • application volume • product rate • Choose an appropriate travel speed • Effective width of application • nozzle spacing • Calculate GPM – Flow rate per nozzle • Select the correct size of nozzle!

  15. Set Up For Uniformity • Label requirements?

  16. Set Up For Uniformity • Determine Your Field Speed • Know it to maintain it! 200 Feet in 27 seconds 20027 X 0.682 = 5 MPH Buy a speed sensor

  17. Set Up For Uniformity • What is the first step? • Use label to select the • application volume • product rate • Choose an appropriate travel speed • Effective width of application • nozzle spacing • Calculate GPM – Flow rate per nozzle • Select the correct size of nozzle!

  18. MATERIALS AND WEAR Percent increase in nozzle flow rate Flat-fan spray nozzles after 40 hour test

  19. Coverage • Need knowledge of the product being used. • Systemic • Contact • What is the target? • Soil • grass • broadleaf (smooth, hairy, waxy)

  20. Calculations #$!@&%! GPA= 5940

  21. Flow Rate Equation • Calculates for amount of flow from one nozzle • Represents the size of nozzle to put on the sprayer

  22. Calculations Ok, now I remember! GPA= 5940

  23. Calibration/Nozzle Selection • What is the first step? • Use label to select the • application volume • product rate • Choose an appropriate travel speed • Effective width of application • nozzle spacing • Calculate GPM • Size of nozzle!

  24. Nozzle size - Variables • Nozzle flow rate (GPM) • Ground speed (MPH) • Effective sprayed width (W) • Application rate (GPA)

  25. Flow Rate Equation • Calculates for amount of flow from one nozzle • Represents the size of nozzle to put on the sprayer

  26. Where: gallons per acre gallons per minute GPA = ______________________ GPM = ______________________ MPH = ______________________ W = ______________________ 5940= a constant to convert gallons per minute, miles per hour, and inches to gallons per acre miles per hour nozzle spacing - inches

  27. Variables 1. Nozzle Flow Rate - Gallons Per Minute (GPM) To double the nozzle output, the pressure must increasetimes 4 2. Ground speed - Miles Per Hour (MPH) 1/2 Doubling the ground speed reduces GPA rate by___ 3. Effective Sprayed Width (W) (Nozzle spacing, band width, number of nozzles on drop)

  28. Electronics/Rate Controllers • How does your system work when speed changes? • What is the effect of going slower? • What is the effect of going faster?

  29. GPM Example • You want to broadcast a foliar herbicide at 10 GPA traveling 5 MPHusing extended range flat-fan nozzles on 20-inch spacing. • Use equation to calculate for flow rate?

  30. GPA Example Solution GPM=? GPA=? MPH=? W=? GPM=? GPA=10 MPH=5 W=20

  31. GPM Example Solution .17 Answer

  32. Calculate GPM (formula) Look under ‘Capacity of 1 nozzle in GPM’ column Match to pressure-psi Choose the size needed Operate at given pressure and speed to achieve GPA Selecting the proper nozzle….

  33. Selecting the proper nozzle….

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