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Advantages of reduced application volumes

Advantages of reduced application volumes. AlanMcCracken www@bdmagro.com. 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

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  1. Advantages of reduced application volumes AlanMcCracken www@bdmagro.com

  2. 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 mph Swath width: 75 ft • Acres/minute: 130 mph x 75 ft / 495 = 19.70 • Aircraft with 40 nozzles: • Spray volume: 1 gpa 5 gpa • Flow rate/minute/nozzle; 0.49 2.46

  3. Calibration with a ground pump

  4. Problems with equipment Nozzles worn Nozzles worn/leaking

  5. Pawnee XB-AOT – old nozzles

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

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

  8. Nozzles all in good condition

  9. LVO with nozzles –94 Nozzles Max Volume 0.5 gpa!

  10. 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

  11. Rain -------- versus ------------Fog - -------------------waterfall Droplet penetration

  12. Droplet uniformity is essential

  13. Nozzles or rotary atomizers?

  14. Rotary atomizers

  15. Drift reduction- coverage not adequate for fungicides/insecticides Large nozzles @ 0 graus Large droplets

  16. 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

  17. Angle of collection devices

  18. 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]

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

  20. Deposition of Fungicide 5 lts/ha-LVO with Rotary atomizers

  21. Trials with products [NOT water]!

  22. Importance droplet spectrum 20 lts/ha – Distribution Conventional Nozzles 20 lts/ha-distribution Rotary atomizers

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

  24. 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.

  25. Control of soybean rust- BR Control Fungicide 6 lts/ha BVO

  26. Glyphosate –Vol 7 liters/ha Not treated 8 days after application

  27. Aerotex results 2004

  28. Many thanks for your attention McCrackenAlan@aol.com

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