A technique that quantifies the efficiency of spray transference to leaf surfaces

Cooper, S.E. and Taylor, W.A. (2004) A technique that quantifies the efficiency of spray transference to leaf surfaces. Aspects of Applied Biology, 71 (2). pp. 423-430.

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A technique is described that may help contribute to the acquisition of data that quantifies the efficiency of spray transfer to natural surfaces; data that is increasingly needed if pesticide use is to be optimized and if 'spray accounting' studies are to be well founded. Provisional data suggests that commercial sprayers may be used under controlled conditions to spray arrays of test material with considerable accuracy. Consideration was given to the location of the test material within the swath, orientation of this material to the spray cloud and the reproducibility of data generation. Targets immediately under a passing nozzle prompted values no different to those that were midway below two adjacent nozzles. The efficiency of spray transfer from a 200 litres/ha application of medium quality sprays to the leaves of radish and barley, when projected to a horizontal surface, were 55 and 58%, respectively. Inclining the leaves to 45 degrees or vertical reduced the amount of spray retained; a reduction that was attributed primarily to a reduced projected surface area for the predominantly vertically falling drops and partly from variations in the impact process. The data suggests that there is scope for improving surface deposit loading through more optimized application systems and/or through formulation change.

Item Type: Article
Divisions: Engineering
Depositing User: Mr Darren Roberts
Date Deposited: 08 Aug 2018 13:54
Last Modified: 08 Aug 2018 13:54
URI: http://hau.repository.guildhe.ac.uk/id/eprint/16541

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