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Glyphosate Spray Drift Management with Drift-Reducing Nozzles and Adjuvants

Published online by Cambridge University Press:  20 January 2017

Adam K. Johnson ,
Fred W. Roeth ,
Alex R. Martin  and
Robert N. Klein
Adam K. Johnson
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska—Lincoln, P.O. Box 830915, Lincoln, NE 68583-0915
Fred W. Roeth
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska—Lincoln, P.O. Box 830915, Lincoln, NE 68583-0915
Alex R. Martin*
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska—Lincoln, P.O. Box 830915, Lincoln, NE 68583-0915
Robert N. Klein
Affiliation:
Department of Agronomy and Horticulture, University of Nebraska—Lincoln, P.O. Box 830915, Lincoln, NE 68583-0915
*
Corresponding author's E-mail: [email protected]
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Abstract

Field experiments were conducted to evaluate the effect of five spray-nozzle types and three drift-control adjuvants (DCA) on glyphosate spray drift. The extended-range (XR) flat-fan nozzle at 280 kPa was used as the standard comparison. DCAs were evaluated for drift reduction with the use of the XR and air-induction (AI) nozzles. Wind speed ranged from 1.3 to 9.4 m/s (3 to 21 mph). Lethal drift (DL) and injury drift (DI) were determined by downwind visual observation of grain sorghum response. Drift distances were measured from the spray swath edge. The Turbo FloodJet and AI nozzles reduced DL distance by 34%. All four drift-reducing (DR) nozzles reduced DI distance by 22 to 32%. Reducing the pressure of the XR flat-fan nozzle from 280 to 140 kPa did not reduce DL or DI distance. When applied through AI nozzles, each DCA increased droplet volume diameter, one DCA reduced DI distance and none reduced DL distance when applied through XR tips. The DCAs did not affect DL or DI distance.

Keywords

Glyphosategrain sorghum, Sorghum bicolor (L.) ‘Topaz’Drift-control adjuvantflat-fan nozzleflood nozzleAI, air inductionAMS, ammonium sulfateDAP, days after plantingDAT, days after treatmentDCA, drift-control adjuvantDG, preorifice flat fanDI, injury driftDL, lethal driftDR, Combo-JetGR, glyphosate resistantHRC, herbicide-resistant cropsTD, TurboDropTF, Turbo FloodJetTT, Turbo TeeJetVMD, volume median diameterXR, extended range
Type
Research
Information
Weed Technology , Volume 20 , Issue 4 , December 2006 , pp. 893 - 897
Copyright
Copyright © Weed Science Society of America 

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