Advantages of reduced application volumes
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Advantages of reduced application volumes. AlanMcCracken [email protected] Introduction. General misconceptions: More volume = better coverage Thicker canopy more volumes! Lack of understanding of simple mechanics. High volumes/nozzle = large droplets/flooding of atomizers Example:

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Advantages of reduced application volumes

AlanMcCracken [email protected]


Introduction

  • General misconceptions: More volume = better coverage

  • Thicker canopy more volumes!

  • Lack of understanding of simple mechanics.

  • High volumes/nozzle = large droplets/flooding of atomizers

  • Example:

  • A typical agricultural aircraft applying fungicides on corn.

  • Flying speed: 130 mphSwath width: 75 ft

  • Acres/minute: 130 mph x 75 ft / 495 = 19.70

  • Aircraft with 40 nozzles:

  • Spray volume:1 gpa5 gpa

  • Flow rate/minute/nozzle; 0.492.46


Calibration with a ground pump


Problems with equipment

Nozzles worn

Nozzles worn/leaking


Pawnee XB-AOT – old nozzles


Pawnee new nozzles D4-45Variation due to corroded springs in check valves


Valve springs –different pressures-no air bleed to end of boom!


Nozzles all in good condition


LVO with nozzles –94 Nozzles Max Volume 0.5 gpa!


CDA signifies the production of ideally sized droplets for each application

Flying insects

50 micron drops

Insects on plants 100-250 micron drops

Diseases on plants

100-250 micron drops

Plants 250-400 micron drops


Rain -------- versus ------------Fog - -------------------waterfall

Droplet penetration


Droplet uniformity is essential


Nozzles or rotary atomizers?


Rotary atomizers


Drift reduction- coverage not adequate for fungicides/insecticides

Large nozzles @ 0 graus

Large droplets


Problems mechanical

  • Volume- Do not increase volume!

  • Phytotoxicity- Eliminate using smaller droplets

  • Penetration – better with less volume

  • Crop coverage –better with more nozzles

  • Results- superior control of rust/insects in soybeans/corn


Angle of collection devices


Effect of angle of collection system- Spray Volume 8 lts/ha.Number of droplets collected per cm² [Average of 119 droplets/cm² on the inclined cards]


Effect of angle of collection system Spray Volume 8 lts/ha.Number of droplets collected per cm²


Deposition of Fungicide

5 lts/ha-LVO with

Rotary atomizers


Trials with products [NOT water]!


Importance droplet spectrum

20 lts/ha – Distribution Conventional Nozzles

20 lts/ha-distribution

Rotary atomizers


Droplets collected during commercial applicationVolume 12 lts/ha [average 58 droplets/cm²]


Conclusions

  • Effective swath width: 18 meters [61 ft] for the application rate and droplet spectrum utilized in the test.

  • Collection papers @ 45 degrees 3- 5 times more efficient than those placed horizontally.

  • A spray volume of 8 -12 liters/hectare is sufficient with 119 droplets/cm² collected

  • Commercial application Vol: 12 liters/hectare 100% control of stink bugs in corn.


Control of soybean rust- BR

Control

Fungicide 6 lts/ha BVO


Glyphosate –Vol 7 liters/ha

Not treated

8 days after application


Aerotex results 2004


Many thanks for your attention

[email protected]


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