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Conventional Soybean Plant and Progeny Response to Glyphosate

Published online by Cambridge University Press:  20 January 2017

Jason K. Norsworthy
Jason K. Norsworthy*
Affiliation:
Department of Crop and Soil Environmental Sciences, Clemson University, 277 Poole Agricultural Center, Clemson, SC 29634
*
Corresponding author's E-mail: jnorswo@clemson.edu
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Abstract

Field studies were conducted to determine the sensitivity of conventional ‘Motte’ and ‘Pioneer 9831’ soybean to simulated glyphosate drift rates applied during vegetative and reproductive development and the effect of glyphosate on progeny. Glyphosate at 8, 84, and 420 g ae/ha was applied to soybean at the V3, V6, R2, and R5 growth stages. Glyphosate at 8 and 84 g/ha did not reduce soybean plant population, growth, or yield or cause deleterious effects on progeny, regardless of the growth stage at application. Soybean population, growth, and yield were reduced as much as 99 to 100% after application of 420 g/ha glyphosate at the V3 growth stage. Glyphosate at 420 g/ha applied at V6 was less detrimental to soybean compared with the V3 timing. Delaying the application of 420 g/ha glyphosate until R2 and R5 reduced soybean yields 22 to 49% and 43 to 44%, respectively. Soybean injury from 420 g/ha glyphosate was generally transient or less severe when applied at the V6 growth stage or later. However, 420 g/ha glyphosate at R5 (initial podfill) caused a 390 to 450 kg/ha yield reduction compared with the V6 application, which indicated greater soybean vulnerability to glyphosate drift during podfill than in the late-stage vegetative development. Although glyphosate at 420 g/ha was injurious to soybean, regardless of application timing, progeny was not affected.

Keywords

Glyphosatesoybean, Glycine max (L.) Merr. ‘Motte’, ‘Pioneer 9831’Glyphosate toleranceherbicide driftherbicide injuryoff-target movementsoybean injuryspray driftWAE, weeks after emergence
Type
Research
Information
Weed Technology , Volume 18 , Issue 3 , September 2004 , pp. 527 - 531
Copyright
Copyright © Weed Science Society of America 

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Footnotes

∗ Technical contribution 4849 from the South Carolina Agriculture and Forestry Research System.

References

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