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Effects of 2,4-D Formulation and Quinclorac on Spray Droplet Size and Deposition

Published online by Cambridge University Press:  20 January 2017

Audie S. Sciumbato
Affiliation:
Texas Agricultural Experiment Station, Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474
Scott A. Senseman*
Affiliation:
Texas Agricultural Experiment Station, Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474
Jim Ross
Affiliation:
Agricultural Experiment Station, Department of Entomology, Plant Pathology, and Weed Science, Las Cruces, NM 88003-8003
Tom C. Mueller
Affiliation:
Department of Plant Sciences, University of Tennessee Knoxville, TN 37996-4561
James M. Chandler
Affiliation:
Texas Agricultural Experiment Station, Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843–2474
Joe T. Cothren
Affiliation:
Texas Agricultural Experiment Station, Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843–2474
Ivan W. Kirk
Affiliation:
USDA-ARS, 2771 F&B Road, College Station, TX 77845
*
Corresponding author's E-mail: s-senseman@tamu.edu

Abstract

Studies were conducted on the campuses of Texas A&M University in College Station, TX, and New Mexico State in Las Cruces, NM, to determine the spray droplet size spectra produced by quinclorac and 2,4-D as the liquid, dry, and emulsion formulations during application with various nozzle sizes using a laser spectrometer. Quinclorac and 2,4-D formulations were also sprayed through three different nozzle sizes in a drift chamber and allowed to settle on glass slides placed downwind. The amounts of each herbicide deposited on the slides were quantified using high-performance liquid chromatography/photodiode array (HPLC/PDA) analysis to assess spray deposition of each formulation at different wind velocities. Data from the laser spectrometer suggested that formulations of 2,4-D affected droplet size, particularly when the 380 ml/min flat-fan nozzle was used. Quinclorac droplet sizes were similar to water regardless of nozzle size. Liquid and dry-formulated 2,4-D tended to be deposited downwind in greater quantities than the emulsion formulation when using the 380 and 760 ml/min spray nozzles with wind velocity of 15 km/h.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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