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1
Evaluation of an experimental sprayer with
rotary atomizers by air characteristics, soil
sedimentation, vertical distribution and drift
potential
Sehsah, El-Sayed G. Bäcker S. Kleisinger
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Content
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Objectives

• Evaluation of an experimental sprayer equipped
  with four hydraulically driven rotary cage
  atomizers(Proptec 100)
• Comparison to a conventional ZA32 axial fan
  sprayer with air guidance and the NA36 axial fan
  sprayer as a reference

Objectives
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• Both ZA32 and the NA36 sprayers were operated
  withATR 208 nozzles at 750 kPa liquid pressure
• Sedimentation measurement was in an apple orchard
  at Überlingen, Lake Constance area, Germany and
  the measurements for vertical distribution and
  drift potentialat the Research Institute
  Geisenheim
• Petri dishes were used as collectors for soil
  sediment, filter paper spaced 20 cm for vertical
  distribution and drift potential with BSF
  fluorescent dye (conc. 0.1 ) for measurement by
  a spectrophotometer

Materials and Methods
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Wanner SZA32/1500
Materials and Methods
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NA 36 reference sprayer
Materials and Methods
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Orientation of the Proptecrotary atomizers
Dimensions in cm
Materials and Methods
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• Air velocities, volume and air direction from two
  different sprayers (ZA32 and Proptec100) were
  measured by an ultrasonic sensor. The three
  dimensional ultrasonic anemometer was connected
  with PC and Data Acquisition system
• The mean values of environmental conditions
  during experiments were 9.8C and 15.9C ambient
  temperature, 63 relative humidity percent for
  vertical distribution and sedimentation
  respectively

Materials and Methods
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Three dimensional ultrasonic anemometer
Proptec rotary atomizer
Materials and Methods
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Collector positioning for soil sedimentation
measurement
Materials and Methods
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Collector positioning in apple orchard
Materials and Methods
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Drift potential and vertical distribution
Tree horizontal beams for drift potential
2 x 4 upright polesfor vertical distribution
Materials and Methods
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Drift potential and vertical distribution
Filter papers fixedon 4 vertical bars
Filter papers fixed on horizontal beams
Materials and Methods
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Air velocity and air volume

• The experimental sprayer produced lower values of
  air velocity compared with NA 36 and ZA32
  sprayers, because the axial fan of the Proptec
  unit is rather small and the outlet for the air
  is wide
• Because of the wide outlet of the Proptec
  atomizer the air volume is rather high

Results and Discussion
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Air velocity profiles
Results and Discussion
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Air velocity and air volume

• The experimental sprayer produced lower values of
  air velocity compared with NA 36 and ZA32
  sprayers, because the axial fan of the Proptec
  unit is rather small and the outlet for the air
  is wide
• Because of the wide outlet of the Proptec
  atomizer the air volume is rather high

Results and Discussion
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Air volume profiles per 10 cm layer
Results and Discussion
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Soil sedimentation
Results and Discussion
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Soil sedimentation
Results and Discussion
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Drift potential
Results and Discussion
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Vertical distribution
Results and Discussion
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Soil sedimentation and drift potential
Conclusions
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Conclusions

• With 200 l/ha and 3.600 rpm rotational speed the
  experimental sprayer with the Proptec units gave
  the best results concerning soil sediment and
  drift potential. Lower volume rates are possible

• With decreasing rotational speed and increasing
  droplet size the soil sediment will increase
  and the drift potential will further decrease
• At very low rotational speed the air velocity
  and air volume is affected considerably
• For the vineyard two units per halve row are
  sufficient, for the apple orchard three are
  recommended

Conclusions
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Conclusions

• With 200 l/ha and 3.600 rpm rotational speed the
  experimental sprayer with the Proptec units gave
  the best results concerning soil sediment and
  drift potential. Lower volume rates are possible

• With decreasing rotational speed and increasing
  droplet size the soil sediment will increase
  and the drift potential will further decrease
• At very low rotational speed the air velocity
  and air volume is affected considerably
• For the vineyard two units per halve row are
  sufficient, for the apple orchard three are
  recommended

Conclusions
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Conclusions

• With 200 l/ha and 3.600 rpm rotational speed the
  experimental sprayer with the Proptec units gave
  the best results concerning soil sediment and
  drift potential. Lower volume rates are possible

• With decreasing rotational speed and increasing
  droplet size the soil sediment will increase
  and the drift potential will further decrease
• At very low rotational speed the air velocity
  and air volume is affected considerably
• For the vineyard two units per halve row are
  sufficient, for the apple orchard three are
  recommended

Conclusions
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Conclusions

• With 200 l/ha and 3.600 rpm rotational speed the
  experimental sprayer with the Proptec units gave
  the best results concerning soil sediment and
  drift potential. Lower volume rates are possible

• With decreasing rotational speed and increasing
  droplet size the soil sediment will increase
  and the drift potential will further decrease
• At very low rotational speed the air velocity
  and air volume is affected considerably
• For the vineyard two units per halve row are
  sufficient, for the apple orchard three are
  recommended

Conclusions
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Evaluation of an experimental sprayer with
rotary atomizers by air characteristics, soil
sedimentation, vertical distribution and drift
potential
Thank You For Your Attention
Sehsah, El-Sayed G. Bäcker S. Kleisinger