Towards a model of spray–canopy interactions: interception, shatter, bounce and retention of droplets on horizontal leaves

Dorr, Gary J., Kempthorne, Daryl M., Mayo, Lisa C., Forster, W. Alison, Zabkiewicz, Jerzy A., McCue, Scott W., Belward, John A., Turner, Ian W. and Hanan, Jim (2013) Towards a model of spray–canopy interactions: interception, shatter, bounce and retention of droplets on horizontal leaves. Ecological Modelling, 290 C: 94-101. doi:10.1016/j.ecolmodel.2013.11.002

Author Dorr, Gary J.
Kempthorne, Daryl M.
Mayo, Lisa C.
Forster, W. Alison
Zabkiewicz, Jerzy A.
McCue, Scott W.
Belward, John A.
Turner, Ian W.
Hanan, Jim
Title Towards a model of spray–canopy interactions: interception, shatter, bounce and retention of droplets on horizontal leaves
Journal name Ecological Modelling   Check publisher's open access policy
ISSN 0304-3800
Publication date 2013-12-11
Sub-type Article (original research)
DOI 10.1016/j.ecolmodel.2013.11.002
Open Access Status
Volume 290
Issue C
Start page 94
End page 101
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Abstract Pesticides used in agricultural systems must be applied in economically viable and environmentally sensitive ways, and this often requires expensive field trials on spray deposition and retention by plant foliage. Computational models to describe whether a spray droplet sticks (adheres), bounces or shatters on impact, and if any rebounding parent or shatter daughter droplets are recaptured, would provide an estimate of spray retention and thereby act as a useful guide prior to any field trials. Parameter-driven interactive software has been implemented to enable the end-user to study and visualise droplet interception and impaction on a single, horizontal leaf. Living chenopodium, wheat and cotton leaves have been scanned to capture the surface topography and realistic virtual leaf surface models have been generated. Individual leaf models have then been subjected to virtual spray droplets and predictions made of droplet interception with the virtual plant leaf. Thereafter, the impaction behaviour of the droplets and the subsequent behaviour of any daughter droplets, up until re-capture, are simulated to give the predicted total spray retention by the leaf. A series of critical thresholds for the stick, bounce, and shatter elements in the impaction process have been developed for different combinations of formulation, droplet size and velocity, and leaf surface characteristics to provide this output. The results show that droplet properties, spray formulations and leaf surface characteristics all influence the predicted amount of spray retained on a horizontal leaf surface. Overall the predicted spray retention increases as formulation surface tension, static contact angle, droplet size and velocity decreases. Predicted retention on cotton is much higher than on chenopodium. The average predicted retention on a single horizontal leaf across all droplet size, velocity and formulations scenarios tested, is 18, 30 and 85% for chenopodium, wheat and cotton, respectively.
Keyword Agrichemical spray
Droplet impaction
Leaf surface model
Mathematical model
Pesticide application
Spray retention
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 13 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 13 times in Scopus Article | Citations
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Created: Fri, 21 Mar 2014, 13:32:19 EST by Jim Hanan on behalf of Centre for Plant Science