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Use of Seedling Growth Parameters to Classify Soybean (Glycine max) Cultivar Sensitivity to Sulfentrazone

Published online by Cambridge University Press:  12 June 2017

Zhaohu Li ,
Robert H. Walker ,
Glenn Wehtje  and
H. Gary Hancock
Zhaohu Li
Affiliation:
Department of Agronomy and Soils, Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
Robert H. Walker
Affiliation:
Department of Agronomy and Soils, Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
Glenn Wehtje
Affiliation:
Department of Agronomy and Soils, Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
H. Gary Hancock
Affiliation:
FMC Corporation, Hamilton, GA 31811
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Abstract

Hypocotyl and root length reduction of soybean (Glycine max) seedlings when seeds were exposed to sulfentrazone during germination were used as indices to classify cultivar response to soil-applied sulfentrazone. Seeds of ‘Stonewall’ (sulfentrazone tolerant) and ‘Asgrow 6785’ (sulfentrazone sensitive) were imbibed and allowed to germinate in 0, 1, 5, 10, and 50 ppm aqueous sulfentrazone solutions for 4 d. Hypocotyl and root lengths were reduced in both cultivars, but the reductions were greater for Asgrow 6785 than for Stonewall. Subsequently, the relative sensitivity of 28 cultivars to sulfentrazone was independently determined by two variations of the hypocotyl reduction method (both conducted in the laboratory) and by traditional full-season field evaluation. Results from laboratory and field studies were in agreement for cultivars distinctly sensitive or tolerant to sulfentrazone. However, cultivars with intermediate tolerance in laboratory studies produced variable responses in the field.

Keywords

Sulfentrazone, N-[2,4-dichloro-5-[4-(difluoromethyl)-4,5-dihydro-3-methyl-5-oxo-1H-1,2,4-triazol-1-yl]phenyl]methanesulfonamidesoybean, Glycine max (L.) Merr.Herbicide toleranceherbicide phytotoxicitycrop tolerancehypocotyl length reductionroot length reductionPRE, preemergence
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 530 - 535
Copyright
Copyright © 1999 by the Weed Science Society of America 

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