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Calibrating Your Field Sprayer. Montana State University Pesticide Safety Education Program. Proper Calibration Offers. Better Pest Control Environmental and human safety Effective use of time Inadequate control = more treatments. Calibrating your Sprayers.

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calibrating your field sprayer

Calibrating Your Field Sprayer

Montana State University

Pesticide Safety Education Program

proper calibration offers
Proper Calibration Offers
  • Better Pest Control
  • Environmental and human safety
  • Effective use of time
  • Inadequate control = more treatments
calibrating your sprayers
Calibrating your Sprayers
  • You need to spray 1 pint / Acre of Insecticide.
    • HOW?
    • Cannot just spread 1 pint over an acre without a carrier can you?
how much to dilute
How much to dilute?
  • Its easier to spread 20 gallons of water (with 1 pint added) over 1 acre than it is to spread 1 pint by itself.
  • The goal…….
  • Find out how many gallons it takes your sprayer to cover one acre
clean your sprayer
Clean your Sprayer
  • Toxic spray equipment
    • Clean with ammonia and water (2 quarts per 25 gallons)
    • Rinse with water
  • Replace nozzles, and filters
determine gpa 4 tools methods
Determine GPA(4 tools/methods)
  • Backpack Sprayer
    • 128th acre method
    • Long hand method
  • Boom Sprayer
    • Calibration Strip Method (Preset Distance)
    • 5940 Method
backpack sprayer gpa 128 th acre method
Backpack Sprayer (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 water into a container for same amount of time.
  • Ounces = Gallons Per Acre Applied
sample scenario using 128 th acre scenario
Sample ScenarioUsing 128th Acre Scenario
  • Takes 10 seconds to spray 128th Acre
  • In 10 seconds you spray 10 ounces.
  • What is the GPA output?

10 GPA

long hand scenario gpa for backpack sprayer
Long Hand ScenarioGPA for Backpack Sprayer

1 - If you have a different sized section that you spray

2 - Measure out known area sq ft / 43,560

3 - Spray known area and time yourself

4 - Spray into bucket for same length of time

5 - Measure amount sprayed and convert to gallons

6 - Multiply number found in step #5 times the number found in step #2.

sample scenario long hand scenario
Sample ScenarioLong Hand Scenario
  • Known area is 66 x 66’ (4,356 sq. ft)
  • 43,560 / 4,356 = 10
  • It took you 2 minutes to spray area
  • Collect 4 gallons in 2 minutes
  • 4 gallons * 10 = 40 gallons per acre
boom sprayers
Boom Sprayers
  • No matter what method of calibration is used, you need to….
  • check nozzle spacing
  • check output across the boom.
nozzle output
Nozzle Output
  • Check nozzle output for 1 minute and get average
  • If each nozzles output is not greater or less than 5% off of average, all is well.
  • How?
5 error level
5% error level
  • To find 5%
  • Find your average…48 oz
  • Move the decimal place one space to the left. 48. = 4.8 This is a 10% error
  • Divide by 2 = 2.4.
  • This is 5% error
  • Now add 2.4 to 48 for +5%
  • Subtract 2.4 from 48 for
  • 5% Error range = 45.6 and 50.4
  • Any nozzle output between 45.6 and 50.4 is OK!
gpa for boom sprayer cont
GPA for Boom Sprayer cont..
  • Nozzle output is same.
  • 18” = 227’ course length
  • 20” = 204’ course length
  • 30” = 136’ course length
  • 40” = 102’ course length
      • Or 340 / spacing in feet
  • Drive course in gear and rpm you will use when spraying and time yourself
gpa for boom sprayer cont1
GPA for Boom Sprayer cont..
  • Conduct 2 or 3 times and get average
  • Collect liquid from 1 nozzle for this amount of time
  • Ounces of liquid collected = GPA
or gpa for boom sprayer can be calculated by
or GPA for Boom Sprayer can be calculated by
  • Gallons applied per strip= GPA
  • Test strip in Acres
sample scenario boom sprayer
Sample Scenario Boom Sprayer
  • 18” wide nozzles, 6 nozzles
  • What to do?
  • Travel 227’ and time
  • 30 seconds
  • Measure amount delivered in that 30 seconds
  • 15 ounces in 30 seconds
  • 15 GPA
how much pesticide to add to the tank
How much pesticide to add to the tank
  • Determine how many acres that can be sprayed with a given GPA.
      • Volume in Tank / GPA = Acres
  • 300 GALLONS / 30 GPA = 10 acres
how much chemical do you need
How much chemical do you need?
  • 2 pints / Acre
  • You will be spraying 10 acres
  • 10 pints of product
5940 method
5940 method
  • GPA = GPM X MPH X W / 5940
  • GPA = Gallons Per Acre
  • GPM = Gallons per Minute collected from a single nozzle (Make sure all nozzle are within a 5% range.)
  • 5940 is a constant
  • MPH = Field Speed
  • W = 1) width between nozzles or2) width of a broadjetswath in inches.
what about field speed
What about field speed?
  • MPH = GPM * 5940 / GPA * W
sample scenario 5940 find speed needed
Sample Scenario5940 find speed needed
  • 1 nozzle / minute output = 0.2 gallons
  • GPA needed is 20 GPA
  • Width of nozzles is 12”
  • MPH = GPM * 5940 / GPA * W
  • = 0.2 * 5940 / 20 * 12
  • = 4.95 mph
gpa is given or required need gpm for each nozzle
GPA is given or required!Need GPM for each nozzle!
  • Then you can purchase appropriate nozzles in GPM
  • Rearrange formula once again
  • GPM = GPA * W * MPH / 5940
  • GPM = 20 GPA * 30” * 5mph / 5940
  • 0.505 or 0.5 GPM nozzles needed
sample questions
Sample Questions

You have an output of 20 GPA

You need to spray 300 acres

#1 - How much volume will you need?

6000 gallons

You need to apply 2 oz / acre of Warrior 1E.

#2 - How much do you put in tank?

600 oz of Warrior

questions continued
Questions Continued

You are calibrating your hand sprayer and it took you 15 seconds to spray 1 18 ½ by 18 ½ ft area.

#3 – What is your GPA?

15 GPA

With this 5 gallon backpack sprayer, you intend to apply 1 oz / acre of product.

#4 - How much do you place in your backpack tank?

Can only treat 1/3 acre at a 15 GPA rate, so 1/3 rate or 1/3 oz

5940 example
5940 example
  • You have checked all your nozzles and the average is 64 ounces per minute (OPM). All nozzles are within 5% of this average.
  • 64 OPM = 0.5 GPM (64 ounces ÷128 oz./gallon)
  • Your field speed is 5 MPH
  • Your nozzles are spaced 20”apart
  • GPA = GPM X 5940 = 0.5 GPM x 5940= 2970
  • MPH X W5 MPH x 20 100
  • GPA = 29.70 or 30 GPA
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