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Comparison of Spray Droplet Characteristics for Nozzles Used for
Agronomic Weed Control
Robert Wolf
Cory Friedli and Brian Lauer
Biological and Agricultural Engineering Dept.
Nozzle Efficacy/Drift Slope
Extended Range
Chamber Design
Venturi Design - I
Venturi Design - II
• XR, TR
• Turbo Flood• Turbo TeeJet
• Air Mix• AI XR• GuardianAir
• AI• Ultra Low Drift• Turbo Drop
• TTI
Nozzle development timeline
New 2008 Test Nozzles!
Turbo TwinJet
AI XR TeeJet
Air Mix & TDHSTF- Greenleaf
GuardianAir - Hypro
Objective
The objective of this study was to compare droplet spectra characteristics for nozzle types used to apply postemergence herbicides.
Materials and Methods cont.:
24 ft. spray bar7.5 GPA @ 10 MPH0.24 GPM / nozzleNozzle Spacing: 20 in.Boom Height: 20 in.
1. XR Flat-fan (XR)
5. AIC Venturi Flat-fan6. TurboDrop High Speed Twin-fan7. Ultra Lo Drift (ULD)8. TTI Venturi Flat-fan
Materials and Methods cont.:
2. DR Flat-fan DR3. Turbo Flat-fan (TT)4. Turbo Twin Flat-fan (TTJ60)
9. BFS Venturi Flat-fan10. AIXR Venturi Flat-fan (AIXR)11. Air Mix Venturi Flat-fan (AM)12. GuardianAir Venturi Flat-fan (GA)
Discussion
Results
DropletScan used to analyze droplets
Droplet scan software was used for droplet characteristics
Volume Median Diameter, Percent Area Coverage, Deposition
Statistical analysis with SAS
Volume Median Diameter
506467 487 491 475 460 462
391
540
377
475
372
0
100
200
300
400
500
600
Mic
ron
s
Droplet Size
ba
efcd
fd bc bc cd d d c
Coverge
Coverge Across Nozzle Type
13.9 13.714.5 14.1
12.313.5 12.9
15.1
10.7
13.6
16.9 17.4
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
Perc
en
t A
rea C
overa
ge
cd cd bc deb
f
cd
a a
bc c cde
Deposition
Deposition Across Nozzle Type
5.2 5.4 5.5 5.34.8
5.3 5.1
5.9
3.8
5.5
6.57.0
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
AIC11
002
AIXR11
0025
AM11
0025
BFS11002
5
DR1100
25
GA11
0025
TDHSTF110
02
TT1100
25
TTI110
02
TTJ601
10025
ULD12
002
XR1100
3
Gal
lon
s p
er A
cre
b b b b b bb b
b b
bb
Findings
• Statistical differences were found for all droplet characteristics measured.
• TTI - largest droplets, with lowest coverage and deposition.
• XR - smallest droplets, with most coverage and deposition.
• ULD – middle on droplet size, 2nd best coverage and deposition.
• Venturi design II group as an average had smaller droplets, better coverage and deposition than the venturi design I group.
Conclusions:
• The findings support that the use of nozzle types producing smaller droplets tend to have more coverage and deposition than those producing larger droplets.
• Data also supports that the newer designs in venturi nozzles will provide more coverage and deposition than the older venturi nozzle designs.
Thanks