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## Calibration using the Test Strip Method (Long Hand)

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### 1 Measure out an area that is 14 x 14 ft. How many square feet is that? 196 square feet #2 How many acres is that? 196/43,560 = 0.004 acre then what? #3 Spray and ... – PowerPoint PPT presentation

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Title: Calibration using the Test Strip Method (Long Hand)

1
Calibration using the Test Strip Method (Long
Hand)
• Cecil Tharp
• Pesticide Education Program
• Montana State University Extension

2
Calibration Benefits You!
• You will not under apply
• Maintains the Best Pest Control
• Will not over-apply
• Environmental and human safety risks
• No need to re-apply
• Effective use of time
• Save

3
Follow Along Using MSU Reference Materials
• Use the MontGuide titled Calibrating Pesticide
Application Equipment
• Pre-calibration
• Testing Nozzles
• Calibrating Output
• Proper Tank Mixing

4
Suggested Calibration Tools
• Stopwatch
• Measuring Tape
• Measuring Container
• Pencil and paper
• Source of fresh water

5
Goal To verify the output of your sprayer. This
depends on
• Speed
• Pressure
• Type of nozzle

6
Pre-calibration
• Make a test strip to verify MPH
• Distance (feet) x 60 Time (seconds) x 88
• It takes 1 minute to travel 88 feet
• How many mph does that equal?
• 1 MPH

7
Calibrating your Backpack Sprayer using Long Hand
Methods
• 1 Measure a test strip area and flag
• Area Length x Width
• (example 15 ft by 15 ft area.?225 square feet)
• 2 Convert test strip to acres
• Acres Area in Square Feet / 43,560
• (example 225 / 43,560 ft 0.00516 acres

8
Calibrating your Backpack Sprayer using Long Hand
Methods
• 3 Spray test strip area with water and time how
long it takes (example 40 seconds)
• Take 3 assessments
• Constant speed and constant pressure
• 4 Collect in a container for
• same amount of time.
• Example 40 seconds in 1 container .1 gallons

9
Now Determine GPA!
• 5 Determine GPA
• GPA Gallons Applied in Test Strip / Test Strip
Acres
• Example 19.38 gallons .1 gallon / 0.00516
acres
• 6 Output 19.38 Gallons Per Acre

10
Sample Scenario Find GPA for Backpack Sprayer
• 1 Measure out an area that is 14 x 14 ft. How
many square feet is that?
• 196 square feet
• 2 How many acres is that?
• 196/43,560 0.004 acre ? then what?
• 3 Spray and time. Sprayed area in 65 seconds.
Then what?
• 4 Sprayed into container for 65 seconds
• ? Get 0.2 Gallons ? then what
• 5 Convert to GPA! GPA Gallons in Test Strip
/ Test Strip Acres
• Example 50 GPA .2 gallon / 0.004 acres

11
CALIBRATING BOOM SPRAYERS
• Find GPA? How?

12
Check nozzle spacing and height
13
Boom Level or Nozzle Angle Correct
14
Worn Spray Tips
15
Verify that all nozzles are equal
16
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?

17
10 error level
• To find 10
• 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
• Nozzle outputs between 43.2 and 52.8 is OK!

18
GPA for Boom Sprayer
• Determine Nozzle Output is the same.
• Establish Spray Strip Dimensions
• -Nozzle spacing (ft) x Test Strip Distance
• -Example Nozzle spacing is 3 ft test strip is
200 ft
• Convert to Acres
• -Square feet in test strip / 43,560 Acres
• -Example 600 / 43,560 0.0137 acres.
• Spray the test strip while measuring time.
• -Spray in gear and rpm you will use when spraying
• -Example 27 seconds to spray the 0.0137 acre
test strip.

19
GPA for Boom Sprayer cont.
• 5. Collect and measure liquid from 1 nozzle
• example. collected 1.1 gal from nozzle in 27
seconds.
• 6. Determine GPA
• -GPA Gallons Applied to Test Strip / Test Strip
Acres
• -Example 1.1 gallon / 0.0137 acres
• 80.29 GPA

20
• Speed
• Slower speed increases output
• Pressure
• Nozzle size
• Use 5940 to get you close
• Not meant for fine adjustments
• Nozzle spacing
• Often preset

21
Speed effects output!
22
• Increasing spray pressure raises the flow rate
• You would need to increase pressure by 4 times to
double flow rate
• Increasing spray pressure decreases droplet size
• This causes drift
• Less than 30 psi generally considered low drift
• Only small adjustments in pressure are
recommended for altering output.

23
You know GPA, now how much solution do you need?
• Acres GPA Volume in Tank
• 10 acres 30 GPA 300 Gallons

24
How much chemical do you need?
• Acres product rate Total Product
• Product Rate 2 pints / Acre
• You will be spraying 10 acres
• 20 pints of product

25
Sample Questions
• You have an output of 20 GPA
• You need to spray 300 acres
• 1 - How much of a spray mixture will you need?
• 6000 gallons
• You need to apply 2 oz / acre of Warrior 1E.
• 2 - How much product do you put in that same
tank?
• 600 oz of Warrior

26
Questions Continued
• 3 You have a 2 ft wide nozzle spacing and
travel 204 in 25 seconds.
• -How many square feet is this strip?
• Length x Width 408 square feet
• -How many acres is this strip?
• square feet / 43,560 0.0093 acres

27
Questions