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ASTM Selected Technical Papers
Pesticide Formulation and Delivery Systems: 39th Volume, Innovative Formulation, Application and Adjuvant Technologies for Agriculture
By
Douglas J. Linscott
Douglas J. Linscott
Symposium Chair and STP Editor
1
Corteva Agrisciences
, Indianapolis, IN,
US
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ISBN:
978-0-8031-7684-3
No. of Pages:
132
Publisher:
ASTM International
Publication date:
2019
eBook Chapter
Droplet Spectrum from CP Nozzles Affected by Pressure, Flat-Fan, and Deflection Angles in Aerial Applications of Glyphosate
By
Guilherme Sousa Alves
,
Guilherme Sousa Alves
1
Agronomy and Horticulture, University of Nebraska-Lincoln
, 402 West State Farm Rd., North Platte, NE 69101,
US
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Bruno C. Vieira
,
Bruno C. Vieira
1
Agronomy and Horticulture, University of Nebraska-Lincoln
, 402 West State Farm Rd., North Platte, NE 69101,
US
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Fernando K. Carvalho
,
Fernando K. Carvalho
2
Agroefetiva
, 689 Pinheiro Machado St., Botucatu, SP 18603-760,
BR
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João Paulo A. R. da Cunha
,
João Paulo A. R. da Cunha
3
Institute of Agricultural Sciences, Federal University of Uberlândia
, Campus Gloria Block CCG, Uberlândia, MG 38410-337,
BR
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Ulisses R. Antuniassi
,
Ulisses R. Antuniassi
4
Dept. of Rural Engineering, São Paulo State University
, 3780 Universitaria Av., Botucatu, SP 18610-034,
BR
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Greg R. Kruger
Greg R. Kruger
1
Agronomy and Horticulture, University of Nebraska-Lincoln
, 402 West State Farm Rd., North Platte, NE 69101,
US
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Page Count:
14
-
Published:2019
Citation
Alves, GS, Vieira, BC, Carvalho, FK, da Cunha, JPAR, Antuniassi, UR, & Kruger, GR. "Droplet Spectrum from CP Nozzles Affected by Pressure, Flat-Fan, and Deflection Angles in Aerial Applications of Glyphosate." Pesticide Formulation and Delivery Systems: 39th Volume, Innovative Formulation, Application and Adjuvant Technologies for Agriculture. Ed. Linscott, DJ. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959 : ASTM International, 2019.
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Spray classification based on droplet size has been used worldwide to characterize nozzles in relation to efficacy and drift potential. The objectives of this study were to evaluate the effect of pressure, flat angle of nozzle, and deflection angle on droplet spectrum in aerial applications of glyphosate using a high-speed wind tunnel. Two independent studies were conducted: one evaluating pressure (207, 310, 414 kPa) and deflection angle (0°, 30°, 60°, 90°) with CP-11TT 8008 nozzles, and another study evaluating flat-fan angle (20°, 40°, 80°) of CP-11TT nozzles with 08 orifice size and the same deflection angles used in a previous study, at 207 kPa pressure. The solution was prepared with water and Roundup PowerMax at 2.34 L ha−1 as a source of glyphosate, simulating a carrier volume of 30 L ha−1. Droplet size data were recorded in a high-speed wind tunnel using a Sympatec HELOS laser diffraction system. The droplet size was affected by interactions between pressure versus deflection angle and flat-fan versus deflection angle. Selecting narrower angles of flat-fan nozzles and deflections, as well as higher pressures, are viable alternatives to mitigate glyphosate drift from aerial applications.
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