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Soybean (Glycine max) Response to Thifensulfuron and Bentazon Combinations

Published online by Cambridge University Press:  12 June 2017

Stephen E. Hart  and
Gordon K. Roskamp
Stephen E. Hart*
Affiliation:
Crop Science Department, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
Gordon K. Roskamp
Affiliation:
Department of Agriculture, Western Illinois University, Macomb, IL 61455
*
E-mail address of corresponding author: s-hart2@uiuc.edu.
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Abstract

Field studies were conducted in 1995 and 1996 at three locations in Illinois to determine soybean response to combinations of thifensulfuron and bentazon. Thifensulfuron was applied at 2.2 to 8.8 g ai/ha alone or in combination with 280 to 560 g/ha of bentazon. Soybean injury 30 d after treatment ranged from 0 to 22% when thifensulfuron was applied alone at 2.2 g/ha. Increasing thifensulfuron rate to 8.8 g/ha increased soybean injury to a range of 12 to 44%. Soybean grain yield was significantly reduced compared to the yield of untreated soybean when thifensulfuron was applied at 4.4 and 8.8 g/ha in two of five and four of five experiments, respectively. The addition of bentazon to thifensulfuron consistently reduced soybean injury and stunting. In many cases, increasing the bentazon rate to 420 g/ha decreased soybean injury from thifensulfuron to a greater extent than 280 g/ha. In cases where thifensulfuron decreased soybean yield, the addition of 420 or 560 g/ha of bentazon restored yields to levels that were not lower than untreated soybeans. These studies demonstrate that thifensulfuron at 2.2 to 8.8 g/ha in combination with bentazon at 420 g/ha may be safely applied to soybean for broadleaf weed control.

Keywords

Bentazon, 3-(1-methylethyl)-(1H)-2,1,3 benzothiadiazin-4(3H)-one 2,2-dioxidethifensulfuron, 3-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acidsoybean, Glycine max L.Herbicide interactionherbicide injuryCOC, crop oil concentrateDAT, days after treatmentMSO, methylated seed oilNIS, nonionic surfactantUAN, urea ammonium nitrate
Type
Research
Information
Weed Technology , Volume 12 , Issue 1 , March 1998 , pp. 179 - 184
Copyright
Copyright © 1997 by the Weed Science Society of America 

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