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Use of rotary atomiser to optimize retention on barley leaves while reducing driftable droplets
Ouled Taleb Salah, Sofiene; Massinon, Mathieu; Boukhalfa, Hassina dite Hafida et al.
2014In International Advances in Pesticide Application, Aspects of Applied Biology 122
Peer reviewed
 

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Keywords :
CDA 120 rotary atomizer; Hydraulic nozzle; Angled spray; spray drift; spray retention
Abstract :
[en] Controlled Droplet Application using rotary atomiser is based on an improved control of droplet size and trajectory comparatively to hydraulic nozzles. On the basis of literature, it was stated that the use of 60° forward angled spray combined with the narrow drop size distribution of a rotary atomiser could lead to low drift and high retention on monocotyledonous and superhydrophobic weeds at early stage. A Micromax120 atomiser was tuned to emit 270 µm VMD, 60° angled forward, to increase interception by the canopy structure. A spray mixture containing a superspreader adjuvant was used to avoid drop bouncing. An increase of spray retention comparatively to a Teejet 11002 at 1.4 bars was observed, although not proved statistically significant by these preliminary trials. On the drift side, the tilted spinning disc seemed to be advantageous since droplet spectra contains a low percentage of droplets under 100 µm and presents an ejection velocity of 25 m.s-1 at 5000 RPM. The spray drift was reduced about 50%. However, these setting were not found as efficient as expected. Indeed, angled spray proved to be more sensitive to advection and turbulence, as the spray was more exposed to the airflow than for the vertical position. It appears that angling the spray and choosing a drop size spectrum with a Volume Median Diameter as big as 270 µm is not sufficient to reduce significantly this issue. Some alternatives as decreasing the emission height are possible with angled sprays but require height control that seems difficult to reach in practical situations.
Disciplines :
Agriculture & agronomy
Author, co-author :
Ouled Taleb Salah, Sofiene ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Massinon, Mathieu ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Boukhalfa, Hassina dite Hafida ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol.
Schiffers, Bruno ;  Université de Liège - ULiège > Chimie et bio-industries > Analyse, qual. et risques - Labo. de Chimie analytique
Lebeau, Frédéric  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Agriculture de précision
Language :
English
Title :
Use of rotary atomiser to optimize retention on barley leaves while reducing driftable droplets
Publication date :
January 2014
Event name :
International Advances in Pesticide Application
Event date :
08-10 January 2014
Audience :
International
Main work title :
International Advances in Pesticide Application, Aspects of Applied Biology 122
Peer reviewed :
Peer reviewed
Available on ORBi :
since 18 January 2014

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