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Utilizing cover crops for weed suppression within buffer areas of 2,4-D-resistant soybean

Published online by Cambridge University Press:  04 October 2021

Connor L. Hodgskiss ,
Bryan G. Young ,
Shalamar D. Armstrong  and
William G. Johnson Open the ORCID record for William G. Johnson [Opens in a new window]
Connor L. Hodgskiss
Affiliation:
Graduate Research Assistant, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
Bryan G. Young
Affiliation:
Professor, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
Shalamar D. Armstrong
Affiliation:
Professor, Department of Agronomy, Purdue University, West Lafayette, IN, USA
William G. Johnson*
Affiliation:
Professor, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN, USA
*
Author for correspondence: William G. Johnson, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907. Email: [email protected]
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Abstract

Cover crops can be utilized to suppress weeds via direct competition for sunlight, water, and soil nutrients. Research was conducted to determine if cover crops can be used in label-mandated buffer areas in 2,4-D-resistant soybean cropping systems. Delaying termination of cover crops containing cereal rye to at or after soybean planting resulted in a 25 to more than 200 percentage point increase in cover crop biomass compared to a control treatment. Cover crops generally improved horseweed control when 2,4-D was not used. Cover crops reduced grass densities up to 54% at four of six site-years when termination was delayed to after soybean planting. Cover crops did not reduce giant ragweed densities. Cover crops reduced waterhemp densities by up to 45%. Cover crops terminated at or after planting were beneficial within buffer areas for control of grasses and waterhemp, but not giant ragweed. Yield reductions of 14% to 41% occurred when cover crop termination was delayed to after soybean planting at three of six site-years. Terminating the cover crops at planting time provided suppression of grasses and waterhemp within buffer areas and had similar yield to the highest-yielding treatment in five out of six site-years.

Keywords

Giant ragweedAmbrosia trifida L.waterhempAmaranthus tuberculatus (Moq.) Sauercereal ryeSecale cereale L.soybeanGlycine max (L.) MerrTermination timing
Type
Research Article
Information
Weed Technology , Volume 36 , Issue 1 , February 2022 , pp. 118 - 129
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Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Weed Science Society of America

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Footnotes

Associate Editor: Prashant Jha, Iowa State University

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