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Determining Spray Output and Pesticide Product to Add to your Spray Tank

Determining Spray Output and Pesticide Product to Add to your Spray Tank. Cecil Tharp MSU Pesticide Education Program Pesticide Education Specialist Department of Animal and Range Montana State University. What is Calibration?.

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Determining Spray Output and Pesticide Product to Add to your Spray Tank

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  1. Determining Spray Output and Pesticide Product to Add to your Spray Tank Cecil Tharp MSU Pesticide Education Program Pesticide Education Specialist Department of Animal and Range Montana State University

  2. What is Calibration? • Calibration is to ensure that your equipment is applying the correct amount of pesticide material uniformly over a given area. • To do this we must know: • Solution delivered over a given area. • Often expressed as GPA or gal per 1,000 square ft. Q1: Can you just add product to tank and understand what it’s delivering to pests?

  3. How often will you calibrate your spray equipment? • Twice • Once • Once every few years • Never

  4. Worn Spray Tips

  5. Shortcuts to Calibration: Follow Along Using MSU Reference Materials • Use the MontGuide titled “Calibrating Ground Sprayers Using Shortcut Methods • 128th Acre Method • Backpack Sprayers • Boom Sprayers • Shortcuts for Broadjet Sprayers • Use the Calibration PocketGuides

  6. Suggested Calibration Tools • Stopwatch • Measuring Tape • Measuring Container • Pencil and paper • Source of fresh water

  7. Backpack Sprayer (Calibrating GPA) 128th Acre Method • Use water when calibrating • Use same nozzles and filters as when spraying • Measure an 18 ½ by 18 ½ ft area. • Spray area with water and time how long it takes • Constant speed and constant pressure • Spray into container for same amount of time. • Ounces = Gallons Per Acre Applied

  8. Spray Management Valve • Reduces number of times manual sprayer needs to be pumped. • Regulates pressure for steady, even flow. • Shuts off spray if pressure falls below set amount. • Allows for constant, precisely calibrated spray application. • Available in 15, 21, 29, and 44 psi • $15 – 20 per valve

  9. SHORTCUT METHOD TO CALIBRATE BOOM SPRAYERS Find GPA? How?

  10. Check nozzle spacing and height off spray canopy

  11. Check Nozzle Spacing and Boom Height

  12. Boom Level or Nozzle Angle Correct

  13. Verify that all nozzles are equal

  14. Due to problems with wear you must test uniformity of nozzles annually • Check nozzle output for 1 minute and get average • If each nozzles output is not greater or less than 10% off of average, all is well. • How?

  15. 10% error level • To find 10% • Find your average…48 oz • Move the decimal place one space to the left. 48. = 4.8 This is a 10% error • Now add 4.8 to 48 for +10% • Subtract 4.8 from 48 for -10% • 10% Error range = 43.2 and 52.8 • Any nozzle output between 43.2 and 52.8 is OK!

  16. Use New Technologies to Verify Nozzle Uniformity when Needed Spot On Spray Calibrator Determines Nozzle Flow Rate $134.96 Agrimart Owensboro, Kentucky Tel: 270-684-4202 www.agrimart.net

  17. Teejet Spray Calibration Calculator • Use spot on calibrator in conjunction with the online Teejet Spray Calibration Calculator to determine GPA of sprayers quickly. • http://www.teejet.com/english/home/calculator/calibration-calculator.aspx • Can be used for spray days, or calibration sessions when quick estimates are needed. • Nozzle Flow Rate • Sprayer Speed • Application Rate (output) • Nozzle Spacing

  18. GPA for Boom Sprayer cont.Shortcut Method 1st – Determine Nozzle output is same. 2nd – Flag out Course Length based on your nozzle spacing 18” = 227’ course length 20” = 204’ course length 30” = 136’ course length 40” = 102’ course length • Or 340 / spacing in feet 3rd - Drive course in gear and rpm you will use when spraying and time yourself. Repeat 2 – 3 times.

  19. GPA for Boom Sprayer cont.. 4th - Collect liquid from 1 nozzle for this amount of time 5th - Ounces of liquid collected = GPA

  20. Sample Scenario Boom Sprayer • 18” wide nozzles, 6 nozzles • What to do? • Travel 227’ and time • 30 seconds, then what? • Measure amount delivered in that 30 seconds • 15 ounces in 30 seconds • 15 GPA

  21. Calibrating Broadjet (boomless) Sprayers

  22. Broadjet Sprayers • Determine Test Strip Distance: • Divide your spray swath (ft) into 340.3 then multiply times 10. This is your test strip distance (ex: 340.3 / 30 feet = 11.34 x 10 = 113.4 feet. • Run test strip and time • (it took 25 seconds to drive 113.4 ft). • Collect your broadjet output (ounces) for the time it took to drive test strip • (Collected 130 ounces in 25 seconds). • Divide the amount collected in ounces by 10. • This equals GPA.130 / 10 = 13 GPA

  23. Sample Scenario #3: ATV Boomless Sprayer25’ wide spray swath

  24. Sample Scenario - Broadjet • 25’ wide swath, 1 Broadjet • What to do? • Travel 136’ and time • 27 seconds • Measure solution delivered in 27 seconds • 200 ounces in 27 seconds • What is the GPA? • 20 GPA

  25. Fine tune your GPA by adjusting: • Speed • Slower speed increases output • Pressure • Only slight adjustments • Nozzle size • Use 5940 to get you close • Not meant for fine adjustments • Nozzle spacing • Often preset

  26. Speed effects output!

  27. Acres * GPA = Volume in Tank You have wish to spray 10 acres with a sprayer calibrated at 30 GPA. How much solution would you need to cover this area? 10 acres * 30 GPA = 300 Gallons How much solution do you need?

  28. How much chemical do you need?(if acres you wish to spray is known) Acres * product rate = Total Product Product Rate = 2 pints / Acre You will be spraying 10 acres 20 pints of product

  29. Use PocketGuides Pesticide per gal = Product Recommendation / GPA Gallons of solution in tank = 3 gallons Product Label Recommendation = 3 oz per acre GPA of Sprayer = 30 GPA How much pesticide product do you need to add to tank. 3 / 30 = 0.1 oz per gallon of solution How much chemical do you need? (spot spraying when acres is unknown)

  30. Sample Questions You have a calibrated output of 20 GPA with your boom sprayer. You need to spray 300 acres. #1 - How much of a spray mixture will you need? Acres * GPA = Volume in Tank = 6000 gallons You need to apply 2 oz / acre of Warrior 1E. #2 - How much product do you put in tank? Acres * product rate = 600 oz of Warrior or Product Recommendation / GPA =2/20 = 0.1oz per gal 0.1oz x 6,000 gallons = 600 oz of Warrior

  31. Questions Continued #3 You have 20” spaced nozzles and travel 204’ in 25 seconds. What next? -You collect 10 ounces in 25 sec. -What is your GPA? GPA = 10 GPA

  32. Questions? #4: What width and length would easily qualify for using the short cut 128th acre method for calibrating your backpack sprayer? #5 Your hand sprayer is calibrated at 30 GPA. You are applying Tordon 22K at 16 oz / acre, and wish to mix up 4 gallons of solution. How much product do you add to tank (in ml’s)? Product Recom / GPA = 16oz/30 = 0.53x30 = 16 ml 16 ml’s per gallon x 4 gallons = 64 ml 18 1/2 x 18 ½ feet

  33. Questions Always Be Prepared!

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