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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
Advantages of reduced application volumes

AlanMcCracken [email protected]


Introduction
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



Problems with equipment
Problems with equipment

Nozzles worn

Nozzles worn/leaking



Pawnee new nozzles d4 45 variation due to corroded springs in check valves
Pawnee new nozzles D4-45Variation due to corroded springs in check valves




Lvo with nozzles 94 nozzles max volume 0 5 gpa
LVO with nozzles –94 Nozzles boom! Max Volume 0.5 gpa!


Cda signifies the production of ideally sized droplets for each application
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 ------------ each applicationFog - -------------------waterfall

Droplet penetration




Rotary atomizers
Rotary atomizers each application


Drift reduction coverage not adequate for fungicides insecticides
Drift reduction- coverage not adequate for fungicides/insecticides

Large nozzles @ 0 graus

Large droplets


Problems mechanical
Problems mechanical fungicides/insecticides

  • 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
Angle of collection devices fungicides/insecticides


Effect of angle of collection system- fungicides/insecticidesSpray 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 cm
Effect of angle of collection system fungicides/insecticidesSpray Volume 8 lts/ha.Number of droplets collected per cm²


Deposition of fungicide
Deposition of Fungicide fungicides/insecticides

5 lts/ha-LVO with

Rotary atomizers


Trials with products not water
Trials with products [NOT water]! fungicides/insecticides


Importance droplet spectrum
Importance droplet spectrum fungicides/insecticides

20 lts/ha – Distribution Conventional Nozzles

20 lts/ha-distribution

Rotary atomizers


Droplets collected during commercial application volume 12 lts ha average 58 droplets cm
Droplets collected during commercial application fungicides/insecticidesVolume 12 lts/ha [average 58 droplets/cm²]


Conclusions
Conclusions fungicides/insecticides

  • 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 of soybean rust- BR fungicides/insecticides

Control

Fungicide 6 lts/ha BVO


Glyphosate vol 7 liters ha
Glyphosate –Vol 7 liters/ha fungicides/insecticides

Not treated

8 days after application


Aerotex results 2004 fungicides/insecticides


Many thanks for your attention fungicides/insecticides

[email protected]


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