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Delayed Burndown in No-Tillage Glyphosate-Resistant Corn (Zea mays) Planted into Soybean (Glycine max) Residue and a Wheat (Triticum aestivum) Cover Crop

Published online by Cambridge University Press:  20 January 2017

Brent E. Tharp  and
James J. Kells
Brent E. Tharp
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
James J. Kells*
Affiliation:
Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824
*
Corresponding author's E-mail: [email protected].
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Abstract

Field trials were conducted in 1998 and 1999 to determine the effect of delayed burndown timings on weed control and yield of no-tillage glyphosate-resistant corn planted into soybean residue and into a wheat cover crop. Burndown treatments containing glyphosate were applied to both trials when the corn was planted (PRE), when the corn began to emerge (SPIKE), or when the corn had three visible leaves (3-LEAF). As burndown timing was delayed, velvetleaf control increased in corn planted into soybean residue. Glyphosate applied at 0.84 kg ae/ha at the SPIKE or 3-LEAF timing followed by a sequential application of glyphosate at 0.84 kg/ha controlled velvetleaf 91% and corn yields were similar to the weed-free plots. Corn yields among the burndown treatments were directly related to velvetleaf control. In the wheat cover crop trial, wheat treated at the PRE timing was completely controlled and corn yields were similar to the weed-free plots. As burndown timings were delayed, corn emergence and yields were severely reduced. Glyphosate applied at 0.84 kg/ha to 25-cm-wide strips over the corn row at planting and followed with delayed burndown timings increased corn emergence and yield.

Keywords

Glyphosate, N-(phosphonomethyl)glycinecorn, Zea mays L. DK 493RRvelvetleaf, Abutilon theophrasti Medicus # ABUTHwinter wheat, Triticum aestivum L.Herbicide-tolerant cropsliving mulchresidual herbicidesPRE, preemergenceSPIKE, at corn emergence3-LEAF, corn with three visible leaves
Type
Research
Information
Weed Technology , Volume 15 , Issue 3 , September 2001 , pp. 467 - 473
Copyright
Copyright © Weed Science Society of America 

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