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Cultural Practices and Glyphosate Applications for Sicklepod (Senna obtusifolia) Control in Soybean (Glycine max)

Published online by Cambridge University Press:  20 January 2017

Jeff W. Barnes  and
Lawrence R. Oliver
Jeff W. Barnes*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
Lawrence R. Oliver
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR 72701
*
Corresponding author's E-mail: [email protected]
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Abstract

A study was conducted in 1995 and 1996 to determine the effect of soybean planting date, tillage level, and glyphosate application on sicklepod control and seed production. Soybean was planted in April, May, June, and July into conventional and no-till seedbeds. Herbicide programs evaluated were metribuzin plus chlorimuron preemergence (PRE) followed by (fb) chlorimuron postemergence (POST) (standard program [STD]), metribuzin plus chlorimuron PRE fb glyphosate POST as-needed, and glyphosate POST as-needed. Control was similar across planting dates in both years with slight variations due to weather. The July planting date had the lowest total sicklepod seed production over the 2-yr study. Sicklepod control was better in conventional tillage, but soybean yields were greater in no-till. Herbicide programs that included glyphosate provided greater sicklepod control, lower sicklepod seed production, and higher soybean yields than the STD. Use of glyphosate in combination with later planting dates, especially July, has the potential to prevent sicklepod seed accumulation in the soil while maintaining yields in a dryland soybean production system.

Keywords

Chlorimuronglyphosatemetribuzinsicklepod, Senna obtusifolia (L.) Irwin and Barnaby # CASOBsoybean, Glycine max (L.) MerrCASOBno-tillplanting dateRoundup Ready soybeansicklepod seedbankfb, followed byPOST, postemergencePRE, preemergenceSTD, standard programWAE, weeks after emergence
Type
Research
Information
Weed Technology , Volume 17 , Issue 3 , September 2003 , pp. 429 - 440
Copyright
Copyright © Weed Science Society of America 

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Footnotes

1 Published with the approval of the Director of the Agricultural Experiment Station.

References

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