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Title: Spray deposition assessment using different application techniques in artificial orchard trees
Authors: Dekeyser, Donald ×
Foque, Dieter
Duga, Ashenafi Tilahun
Verboven, Pieter
Hendrickx, Nico
Nuyttens, David #
Issue Date: Jun-2014
Publisher: Butterworth
Series Title: Crop Protection vol:64 pages:187-197
Abstract: Seven orchard spray application techniques were compared in terms of within-tree deposition quality
and off-target losses to the ground and behind the target trees. The studied spray techniques included
different sprayer types, fan speeds and air deflector settings. An artificial pear canopy was realized for
this purpose. Filter papers and a multiple tracer methodology were used to evaluate deposition. All
measurements were conducted indoor and will be used as an input and to validate a CFD orchard spray
model.
Results showed that spray application technique has an effect on spray deposition. Sprayer design
caused major differences in spray distribution and off-target losses. A sprayer with individual spouts gave
the highest deposits on the tree (0.15 L), followed by an axial sprayer (0.10e0.12 L). Changing settings on
the axial sprayer only caused minor differences, although the high fan gear performed significantly better
than the low gear. Lowest tree depositions were found for a cross-flow sprayer (0.08e0.09 L). A significant
portion of the spray liquid was lost to the ground and directly behind the trees with all spray
techniques. The axial fan sprayer and the sprayer with individual spouts caused higher ground deposits
than the cross-flow sprayer. The cross-flow sprayer on the other hand gave higher losses behind the
trees, especially when a high fan speed was applied.
ISSN: 0261-2194
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Mechatronics, Biostatistics and Sensors (MeBioS)
Gene Expression Unit
× corresponding author
# (joint) last author

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