Article (Scientific journals)
Contribution of Spray Droplet Pinning Fragmentation to Canopy Retention
Boukhalfa, Hassina dite Hafida; Massinon, Mathieu; Belhamra, Mohamed et al.
2014In Crop Protection, 56, p. 91-97
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Keywords :
Pinning fragmentation; Retention; Drop impact; Splashing; Wenzel wetting regime
Abstract :
[en] Drop behaviour during impact affects retention. The increase of adhesion is usually seen as the objective when applying crop protection products, while bouncing and shattering are seen as detrimental to spray retention. However, observation of drop impacts on barley (Hordeum vulgare L.) using high speed shadowgraphy shows that bouncing and fragmentation can occur in Cassie-Baxter as well as in Wenzel wetting regimes. In this last regime, a part of the drop may remain stuck on the surface, contributing to retention. Using simultaneous measurements of drop impacts with high speed imaging and of retention with fluorophotometry for spray mixtures on excised barley leaves using a Teejet 11003 nozzle at 0.2 MPa, it is observed that about 50% of the drops that fragmented in the Wenzel state remain on the horizontal leaf. Depending on the spray mixture, these impact outcomes accounted for 28 to 46% of retention, the higher contribution being correlated with bigger VMD (Volume Median Diameter). This contribution is not negligible and should be considered when modelling spray retention processes.
Disciplines :
Environmental sciences & ecology
Agriculture & agronomy
Author, co-author :
Boukhalfa, Hassina dite Hafida ;  Université de Liège - ULg/ Université Mohamed Khider Biskra-Algérie > Sciences et Technologie de l'Environnement/ Sciences Agronomiques > Unité de Mécanique et construction > Doct. sc. agro. & ingé. biol.
Massinon, Mathieu ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Mécanique et construction
Belhamra, Mohamed;  Université Mohamed Khider Biskra-Algérie > Sciences Agronomiques
Lebeau, Frédéric  ;  Université de Liège - ULiège > Sciences et technologie de l'environnement > Mécanique et construction
Language :
English
Title :
Contribution of Spray Droplet Pinning Fragmentation to Canopy Retention
Alternative titles :
[fr] Contribution des gouttes en fragmentation partielle à la rétention sur la végétation
Publication date :
February 2014
Journal title :
Crop Protection
ISSN :
0261-2194
eISSN :
1873-6904
Publisher :
Elsevier Science
Volume :
56
Pages :
91-97
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Higher Education and Scientific Research Ministry of People's Democratic Republic of Algeria
Commentary :
- We investigated retention for drops splashing in the Wenzel wetting regime - 45 to 58 % of the volume of these drops remained on the leaf after impact - This contributed from 28 to 46% of the retention on barley, and was a function of formulation and VMD - The contribution of these drops should be included in process-based retention models
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since 09 December 2013

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