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Evaluation of weed control provided by three winter cereals in conservation-tillage soybean

Published online by Cambridge University Press:  12 February 2007

Andrew J. Price ,
D. Wayne Reeves  and
Michael G. Patterson
Andrew J. Price*
Affiliation:
USDA-ARS, National Soil Dynamics Laboratory, Agriculture Research Service, United States Department of Agriculture, 411 South Donahue Drive, Auburn, AL 36832, USA,.
D. Wayne Reeves
Affiliation:
USDA-ARS, J. Phil Campbell, Sr. – Natural Resource Conservation Center, 1420 Experiment Station Road, Watkinsville, GA 30677, USA,.
Michael G. Patterson
Affiliation:
Agronomy and Soils Department, Auburn University, 202 Funchess Hall, Auburn, AL 36830, USA,.
*
*Corresponding author: Email: [email protected]
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Abstract

Information is needed on the role of cover crops as a weed control alternative due to the high adoption of conservation tillage in soybean [Glycine max (L.) Merr.] production. Field experiments were conducted from fall 1994 through fall 1997 in Alabama to evaluate three winter cereal cover crops in a high-residue conservation-tillage, soybean production system. Black oat (Avena strigosa Schreb.), rye (Secale cereale L.), and wheat (Triticum aestivum L.) were evaluated for their weed-suppressive characteristics compared to a winter fallow system. Three herbicide systems were utilized: no herbicide, a mixture of two pre-emergence (PRE) herbicides, or PRE plus post-emergence (POST) herbicides. The PRE system contained pendimethalin plus metribuzin. The PRE plus POST system contained pendimethalin plus a prepackage of metribuzin and chlorimuron ethyl applied PRE, followed by an additional chlorimuron ethyl POST application. No cover crop was effective in controlling weeds without a herbicide. However, when black oat or rye was utilized with only PRE herbicides, weed control was similar to the PRE plus POST input system. Thus, herbicide reductions may be attained by utilizing cover crops that provide weed suppression. Rye and black oat provided more effective weed control in the PRE only herbicide input system than wheat in conservation-tillage soybean. The winter fallow, PRE plus POST herbicide input system yielded significantly less soybean one out of three years when compared to systems that included a winter cover crop.

Keywords

Avena strigosa Schrebcover cropsSecale cereale LTriticum aestivum L
Type
Review Article
Information
Renewable Agriculture and Food Systems , Volume 21 , Issue 3 , September 2006 , pp. 159 - 164
Copyright
Copyright © Cambridge University Press 2006

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