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Calibration

Calibration. How much pesticide do I add to the tank?. Gallons per acre or GPA How many acres can we spray with a certain volume What is the labeled rate Dose calculation (how much do I add to the tank). GPA. Calibration Strip Method Single Nozzle Method 128 th acre method.

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Calibration

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  1. Calibration

  2. How much pesticide do I add to the tank? • Gallons per acre or GPA • How many acres can we spray with a certain volume • What is the labeled rate • Dose calculation (how much do I add to the tank)

  3. GPA • Calibration Strip Method • Single Nozzle Method • 128th acre method

  4. But first….Determining GPAwith a backpack or hand sprayer 18 ½ feet 1 8 ½ feet

  5. Backpack - GPA • 18 ½ x 18 ½ foot square • Spray & time yourself • Spray into bucket • Collect in Ounces • Ounces = GPA • Why does this work?

  6. Backpack GPAExample • Sprayed calibration square and it took 45 seconds • Sprayed into bucket for 45 seconds and collected 64 ounces • GPA = 64

  7. Calibration Strip Method • Take a small area and relate it to an acre • Need to know area of small area (calibration strip) • Amount of liquid sprayed over strip • Number of strips in an acre • One acre = 43,560 ft2

  8. Calibration Strip Method • 66 feet (swath) x 66 feet (calibration strip) • = 4,356 ft2 • 43,560 ft2 = 10 strips 4,356 ft2 • 3 gallons per strip • 10 strips x 3 gal/strip • GPA = 30

  9. Boom Sprayers • No matter what method of calibration is used, you need to…. • check nozzle spacing • check output across the boom.

  10. Checking Nozzle Spacing & Height

  11. Nozzle Orientation

  12. Nozzle output

  13. Checking Nozzle Output

  14. Remember!Check Nozzle Spacing 20” Then……

  15. Check Nozzle Output! • 51 oz 50 oz 42 oz

  16. Output should be within 10% of the average of all the nozzles • Nozzle 1 = 51 oz • Nozzle 2 = 50 oz • Nozzle 3 = 42 oz • 143 oz • 143 oz  3 = 48 oz  4.8 or 5 43………48……..53 maybe 45½…48….50 ½ Check Nozzle # 3 Check Nozzle 1& 3 • Recheck Recheck 10% 10% 10%

  17. Nozzles Output in Ounces 21 Seconds 1. 14.0 2. 13.0 ***** 3. 16.0 4. 15.0 5. 15.0 6. 15.0 7. 14.0 8. 15.0 9. 16.010. 16.0 149.0 Average = 14.9 or 15 ounces +10% = 16.5 ounces -10% = 13.5 ounces

  18. Boom Sprayer Calibration Strip Method • Need swath width (W) • Course length (L) • Number of strips in one acre 43,560 ft2 L x W Amount of liquid applied per strip

  19. Using test strip

  20. Collect from each nozzle using test strip time.

  21. Figure your GPA • Example: • Swath width is 35 ft • Course length is 200 ft • Calibration strip = 7,000 ft2 (35 x 200) • There are 6.22 strips in one acre (43560 ÷ 7000) • You collect from all the nozzle into one bucket • 4 gallons • 6.22 x 4 = 24.88 or 25 GPA

  22. Broadjet 0.5 g in 13 sec. 100 43560 = 12.8 3400 34 12.8 x 0.5 g = 6.4 GPA

  23. Boom-GPA 15 ounces = 15 GPA Check the label May be too low.

  24. Changing Output (GPA) Nozzles Speed Pressure

  25. How many acres can you spray. Volume used GPA

  26. How many acres can you spray - Example • Have a 1000 gallon tank. Only want to apply 500 gallons. • GPA = 25 • 500 gallons = 20 acres • 25 GPA • Backpack • 5 gallons = 0.078 acres • 64 GPA

  27. Acres - Example 2 • Suppose you only want to spray 10 acres. • GPA = 25 (25 GPA) • 25 GPA x 10 acres = 250 gallons

  28. Dosage Determination • Listed rate per acre …Read the label • Lbs. of a.i. per acre • Liquid • % W.P.

  29. Listed Rate Per Acre • Acres x labeled rate = dose • 10 acres x 1 pint/acre = 10 pints in a given volume • 300 gallon mix = 10 acres 30 GPA • 10 pints of product to make a 300 gallon mix.

  30. Pounds per Acre - Liquid Example – 1 lb of a.i. is recommended per acre 1 gal. Formulation x 1 lb a.i = 0.5 x 1 = 0.5 gal formulation/acre 2 lb a.i. Acre Rate = 1 = 0.5 gallons formulation/acre Lbs. a.i./gallon 2

  31. Dry Formulations • 2 lbs per acre of an 80% WP is prescribed 1 lb formulation x 2 lb a.i. = 2.5 lbs formulation/acre 0.80 lb a.i. Acre Rate per acre = 2 lb a.i. = 2.5 lbs % a.i. 0.80

  32. How much product to add to tank. • Rate/acres x acres treated • Example: • 1 pt/acre x 10 acres = 10 pints. • Backpack • 0.078 acres x 16 oz. = 1.2 oz.

  33. Boom Sprayer GPA128th Acre Method • Measure distance between nozzles. • Use chart for test course distance. • Nozzle output must be close to uniform • Ounces collected from one nozzle = GPA • Nozzle spacing (in.) Test Strip (ft) • 20 204 * *340 ÷ spacing (ft) • 30 136 • 36 113 • 38 107 • 40 102

  34. Broadjet -= 128th Acre Method • Measure swath width • Set calibration course • Swath width Course length • 35 156 * *5460 ÷ W (ft) • 40 136 • 45 121 • Time yourself • Collect for same time • Pints collected = GPA

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