Experiences with Pecan Air Blast Sprayers

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Experiences with Pecan Air Blast Sprayers
Paul E. Sumner Extension Agricultural
Engineer Tifton, Ga 229-386-3442 psumner_at_uga.edu
University of Georgia
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Coverage is Essential for Maximum Production
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REGULATORY AND ENVIRONMENTAL ISSUES
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Pecan Sprayer Clinics

• Check Sprayer Speed
• Record Nozzle Configuration
• Check Spray Placement
• Make Recommendations

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VOLUME OF DEAD AIR
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Orchard Air Blast Sprayer Comparison
Pecan Tree Size 54 60 ft
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Orchard Air Blast Sprayer Comparison
Pecan Tree Size 16.5 18.0 m
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Orchard Air Blast Sprayer Comparison
Tree Size, AeroFan Engine, 2.0 mph
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Orchard Air Blast Sprayer Comparison
Speed Spraying, DW PTO 36 Fan
3.1 to 2.4 km/h 29.8 1.9 to 1.5 mph
4.8 to 2.4 km/h 34.9 3.0 to 1.5 mph
4.8 to 3.1 km/h 7.8 3.0 to 1.9 mph
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One Side Spraying
Two Side Spraying
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Orchard Air Blast Sprayer Comparison
One vs. Two Side Spraying, DW PTO 36 Fan, 3.1
km/h
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Orchard Air Blast Sprayer Comparison
One vs. Two Side Spraying, DW Engine 42, 3.1
km/h
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2/3 volume
D5-45
D7-45
D6-45
D5-45
1/3 volume
D4-45
Boom
D3-45
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Orchard Air Blast Sprayer Comparison
Reduction of Nozzles 14 increase
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Day and Night Spraying
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Orchard Air Blast Sprayer Comparison
Large Tree, 85 ft (26.5 m), 3.7 km/h
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Orchard Air Blast Sprayer Comparison
Medium Tree, 56 ft, 2 mph 23 increase
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RECOMENDATIONS
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2/3 - 3/4 Spray Directed Toward Top 1/2 of Tree
1/2
1/2
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Hollow Cone Nozzles
Core
Disc
2/3 volume
D5-45
D7-45
D6-45
D5-45
1/3 volume
D4-45
Boom
D3-45
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Savage
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Nozzle Orientation
Coarse
Fine
Perpendicular
Parallel
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Two Sided Spraying Up to 80 percent Leaf Canopy
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Sprayer Speed Less than 2.5 mph Higher
Performance lt 2.0 mph
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SPEED

• Slow enough to displace untreated air with
  chemical laden air
• Large fans deliver more air volumebetter
  coverage
• Small fans should be used on small trees(lt40 ft)
• Slower the speed better the coverage
• Slower the speed more GPA /w same nozzles
• Same GPA ? re-nozzle

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Rate per Acre
TREE SIZE GPA
Up to 25 ft 25 25 to 50 50 - 75 50 and
Up 100 - 125
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Questions?