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Response of Glyphosate-Resistant Soybean to Glyphosate During Reproductive Development

Published online by Cambridge University Press:  20 January 2017

Donnie K. Miller ,
Derek M. Scroggs ,
Ernest L. Clawson  and
David Y. Lanclos
Donnie K. Miller*
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
Derek M. Scroggs
Affiliation:
Dean Lee Research Station, LSU AgCenter, 8105 Tom Bowman Drive, Alexandria, LA 71302
Ernest L. Clawson
Affiliation:
Northeast Research Station, LSU AgCenter, P.O. Box 438, St. Joseph, LA 71366
David Y. Lanclos
Affiliation:
Dean Lee Research Station, LSU AgCenter, 8105 Tom Bowman Drive, Alexandria, LA 71302
*
Corresponding author's E-mail: dmiller@agctr.lsu.edu
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Abstract

Two field studies were conducted in 2004 and 2005 to evaluate the response of glyphosate-resistant ‘TV52R42’ and ‘TV52R14’ soybean to glyphosate at 0, 458, 916, 1,375, 1,833, or 2,749 g ae/ha applied at the R4 reproductive growth stage and at R4 followed by the same rates at R6. A single glyphosate application at the R4 stage did not injure soybean or cause reductions in soybean height, nodes per plant, branch pods, main stem pods, or yield, regardless of application rate. Likewise, sequential applications of glyphosate at the R4 followed by R6 growth stages resulted in no adverse effects on growth parameters or yield. Preliminary findings indicate excellent tolerance to glyphosate application at reproductive growth stages beyond the currently labeled R2 growth stage restriction in varieties evaluated. Research findings warrant evaluation of an expanded range of germplasm under a variety of environmental conditions and potential effects on seed quality for establishment of tolerance levels and potential herbicide label amendments.

Keywords

Glyphosate, soybean, Glycine max (L.) Merr. ‘TV52R42’ and ‘TV52R14’Glyphosate-resistant soybeanherbicideinjuryreproductive-growth-stage applicationyield
Type
Notes
Information
Weed Technology , Volume 22 , Issue 2 , June 2008 , pp. 359 - 362
Copyright
Copyright © Weed Science Society of America 

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