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Effect of Formulation and Application Time of Day on Detecting Dicamba in the Air under Field Conditions

Published online by Cambridge University Press:  20 January 2017

Thomas C. Mueller ,
Daniel R. Wright  and
Kirk M. Remund
Thomas C. Mueller*
Affiliation:
Department of Plant Sciences, University of Tennessee, 252 Ellington Plant Sciences Bldg., 2431 Joe Johnson Dr., Knoxville, TN 37996
Daniel R. Wright
Affiliation:
Monsanto Company, 800 North Lindbergh, St. Louis, MO
Kirk M. Remund
Affiliation:
Monsanto Company, 800 North Lindbergh, St. Louis, MO
*
Corresponding author's E-mail: tmueller@utk.edu
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Abstract

The development of dicamba-tolerant and other auxin-tolerant crops will enable the use of these effective herbicides in soybean and cotton at application timings such as at planting or over-the-top that are not currently possible. This research examined the effect of various factors on detection of postapplication amounts of dicamba in the air under field conditions by coupling a sample collection system with advanced chemical analysis of those samples. The quantity of dimethylamine salt of dicamba that was detected within 48 hr after application was two times greater (P < 0.05) than the quantity of diglycoamine salt formulation based on field studies in 2009. Regardless of application timing, the amount of detected dicamba was greatest during the 0 to 12 hr time period after application. However, the total detected after 48 hr was less for evening applications (5 micrograms [µg]) compared with midday (17 µg) or morning (14 µg) applications based on 2010 field trials. Average ambient air temperature (and other weather variables) correlated with higher detection levels of dicamba in the air in the field.

Keywords

Dicambasoybean, Glycine max (L.) MerrDicambadriftoff-site movementstewardshipvolatility
Type
Soil, Air, and Water
Information
Weed Science , Volume 61 , Issue 4 , December 2013 , pp. 586 - 593
Copyright
Copyright © Weed Science Society of America 

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