calibrating spray equipment page 69 why calibrate better pest control environmental and human safety...
TRANSCRIPT
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Calibrating Spray Calibrating Spray EquipmentEquipment
Page 69
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Why CalibrateWhy Calibrate
• Better Pest Control• Environmental and human safety• Effective use of time
– Inadequate control = more treatments• Cost/Benefit ratio
– Lack of calibration = improper mixing– 1 gallon of Tordon per 100 gallons of water
• Will revisit
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What’s An Application What’s An Application RateRate
• Gallons of liquid applied per acre• GPA• Water and pesticide mixed• a.k.a.
– Sprayer volume– Sprayer output
• Need to know GPA for mixing
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Variables Affecting GPAVariables Affecting GPA
• Ground Speed (MPH)– Speed up = less liquid = lower application rate – Slow down = more liquid = increased application rate
Consistency
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Variables Affecting GPAVariables Affecting GPA
• Nozzle Flow Rate– GPM– Depends on
Orifice size
= 0.50 GPM
= 0.20 GPM
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Variables Affecting Variables Affecting GPAGPA
• Pressure– 4x pressure to double GPA– Increased pressure = smaller droplets
For Minor Adjustments Only
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Variables Affecting GPAVariables Affecting GPA• Spray Width or Spacing
– 100% swath overlapping doubles output
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Variables Affecting GPAVariables Affecting GPA
• Nozzle Wear– Worn tips =
• Over application• Erratic patterns
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• Label requirements
Figuring Out Figuring Out GPAGPA
More GPA = More Coverage
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• Label requirements
Figuring Out GPAFiguring Out GPA
• Determine Your Field Speed
– Know it to maintain it!
200 Feet in 27 seconds20
027= 5 MPH
X 0.682
Buy a Buy a speed speed sensorsensor
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• Label requirements• Determine Your Field Speed
Figuring Out Figuring Out GPAGPA
• Collect from each nozzle
- Find GPM Ounces . 128 oz. Per gallon
= Gallons
64 ounces = 0.5
Gallons
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• Label requirements• Determine Your Field Speed• Collect from each nozzle
– Want output of one nozzle– Simply plug in the numbers
Figuring Out GPAFiguring Out GPA
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GPA is given or required!GPA is given or required!Need GPM for each nozzle!Need GPM for each nozzle!
Rearrange formula
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How Much To Add To The How Much To Add To The TankTank
• Acres that can be sprayed with a Acres that can be sprayed with a given volume in the tankgiven volume in the tank
• GPAGPA• Labeled RateLabeled Rate
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How Much To Add To The How Much To Add To The TankTank
• Acres that can be sprayed with a Acres that can be sprayed with a given volume in the tankgiven volume in the tank
VolumeGPA
= Acres
500 gal.25 GPA
= 20 Acres
20 Acres x 25 GPA = 500 gallons
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How Much To Add To The How Much To Add To The TankTank
• Acres that can be sprayed with a given volume in the tank
• GPA• Labeled RateLabeled Rate
20 acres x 3 pints/acre
= 60 pints
Gallons?
60 pints
8 pints/gal.
= 7.5 gal.
Acres x labeled rate per acre
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1 gallon of Tordon per 100 gallons of water- Sprayer applied 50 GPA- Could spray 2 acres with 100 gallons
100 gallons 50 GPA = 2 acres- Rate was 1 quart per acre- Only needed to add 2 quarts per 100
gallons2 acres x 1 quart per acre = 2
quarts per 100 gallons
- Over applied by 2x ($40 per acre)