Calibrating a Backpack Sprayer - WordPress.com · 23/08/2019 · Calibration: Backpack •Know...
Transcript of Calibrating a Backpack Sprayer - WordPress.com · 23/08/2019 · Calibration: Backpack •Know...
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Calibrating a Backpack Sprayer August 23, 2019
Scott Wanzor: [email protected] /// 404-434-4442
Coastal Georgia Botanical Gardens
Savannah, GA
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Since everybody here loves math…… Here are 3 slides on the value of understanding knowing how to calibrate a backpack or pump-up
sprayer and how that knowledge can save you money!
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Calibration
1 gallon of water covers how many square feet?
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Calibration: Backpack
• Know your water volume per 1,000 ft2
• Always double check rates of pesticide
Correct Example… (Slide 1 of 2 slides…)
• Label says to apply 3 oz. 1,000 ft2: - Amount of water you apply per 1,000 ft2 = 2 gallons - 3 gallon backpack sprayer
- Will cover 1,500 ft2 (3 gals water divide by 2 gals/1,000 ft2)
- Therefore: Mix 4.5 oz. of herbicide in this backpack (3 oz./1,000 ft2 x
1,500 ft2 …or… 3 x 1.5)
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Calibration: Backpack
Incorrect example: (Slide 2 of 2 slides…)
• Label calls for 3 oz./1,000 ft2 - 3 gallon backpack sprayer
- You mix 3 oz. x 3 gallons of water (3 oz. for each gallon of water)
- 9 oz. of herbicide
• Correct amount of herbicide is 4.5 oz. per 3
gallons. 9 oz. is double the rate on the label! 1) Excellent weed control!
2) Off label use!
3) Paid twice too much $$$!
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Liquid applications:
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Do you use backpacks?
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Flat fan nozzles should only be
held in a stationary position while
spraying.
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Attached to a
backpack
sprayer
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Spray wand held correctly,
non-swinging arm motion
providing a flat band pattern
Spray wand turned sideways
“swinging arm motion” resulting
In a zig zag pattern.
Slide of Spray Techniques Used For Training of Applicators
Glyphosate mis-application
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Uniform weed or insect control?
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High Pressure
Spray Wand High pressure, high volume nozzle,
spray wand used in Florida
200 psi pressure?
So it floats?
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Drying Patterns
Flat fan nozzle
turned sideways
using a “swinging
arm motion”
Initially the
pattern appears
uniform
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Zig Zag pattern
is starting to
show
Over application in
others areas can
result in injury.
Drying Patterns
Uneven pattern--
under application
can result in poor
control
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Over
Application
As the spraying
pattern continues
to dry, under
application
becomes more
obvious.
Drying Patterns
Uniform weed or insect control?
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Flat Fan
Misapplication
High pressure, large nozzle
spray wand used with a
swinging arm motion
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Drift versus Volatility
Huge, fundamental difference!
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Drift • Definition: Spray droplets – However small
• Droplet size: Smaller more likely to drift
– Pressure
– High volume
– Low volume
• Wind moves fine droplets
• Spray tip height
• Operating speed
• Air temperature & Humidity
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Volatility
• Definition: Gas or vapor of the chemical
• Amine:
– Water-based
– No volatility
• Esters:
– Oil or solvent-based
– Some new technology: Low volatile esters
– Many years ago esters were much more
volatile
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Fine Droplets
Large Droplets
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Misapplications
Uniform weed or insect control??
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Spray Nozzle
Wear
No Wear
Some Wear Heavy Wear
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CALIBRATION
CALIBRATION
CALIBRATION
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Calibration
CANNOT
keep calibrated
—Adjustable—
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Spray Rate
vs
Spray Volume
RATE: Per 1,000 Square Feet
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What happens when a high rate of
herbicide is mixed or applied
incorrectly?
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CORRECT
RATE OF
HERBICIDES
ARE VERY
IMPORTANT!
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Pressure
Regulators
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Calibrating a Backpack Sprayer August 23, 2019
Scott Wanzor: [email protected] /// 404-434-4442
Coastal Georgia Botanical Gardens
Savannah, GA