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Effect of Planting Date, Residual Herbicide, and Postemergence Application Timing on Weed Control and Grain Yield in Glyphosate-Tolerant Corn (Zea mays)

Published online by Cambridge University Press:  20 January 2017

Steven A. Gower ,
Mark M. Loux ,
John Cardina  and
S. Kent Harrison
Steven A. Gower
Affiliation:
Department of Horticulture and Crop Science, The Ohio State University, Columbus, OH 43210, and the Ohio Agricultural Research and Development Center, Wooster, OH 44691
Mark M. Loux*
Affiliation:
Department of Horticulture and Crop Science, The Ohio State University, Columbus, OH 43210, and the Ohio Agricultural Research and Development Center, Wooster, OH 44691
John Cardina
Affiliation:
Department of Horticulture and Crop Science, The Ohio State University, Columbus, OH 43210, and the Ohio Agricultural Research and Development Center, Wooster, OH 44691
S. Kent Harrison
Affiliation:
Department of Horticulture and Crop Science, The Ohio State University, Columbus, OH 43210, and the Ohio Agricultural Research and Development Center, Wooster, OH 44691
*
Corresponding author's E-mail: loux.1@osu.edu
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Abstract

Studies were conducted in 1998 and 1999 in Ohio to determine the effect of postemergence (POST) application timing of glyphosate on weed control and grain yield in glyphosate-tolerant corn, and how this was influenced by corn planting date and the use of soil-applied herbicides. Glyphosate was applied based on giant foxtail height. Two applications of glyphosate provided better weed control than a single application, especially when applied to weeds 10 cm or less in early-planted corn. Yield was reduced occasionally with a single application on 5- or 10-cm weeds, because of weed re-infestation. Failure to control weeds before they reached a height of 15 to 30 cm also resulted in occasional yield loss. Application of atrazine or acetochlor plus atrazine prior to glyphosate did not consistently increase weed control or yield. Results suggested that glyphosate should be applied before weeds reach 15 cm in height to avoid corn grain yield loss.

Keywords

Glyphosategiant foxtail, Setaria faberi Herrm. #3 SETFAcorn, Zea mays L.Herbicide-resistant cropsweed interferenceCEC, cation exchange capacityPOST, postemergencePRE, preemergenceRS, resprayWAP, week after planting
Type
Research
Information
Weed Technology , Volume 16 , Issue 3 , September 2002 , pp. 488 - 494
Copyright
Copyright © Weed Science Society of America 

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References

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