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

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 cere...

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Bibliographic Details
Published in:Weed technology 2022-02, Vol.36 (1), p.118-129
Main Authors: Hodgskiss, Connor L, Young, Bryan G, Armstrong, Shalamar D, Johnson, William G
Format: Article
Language:English
Subjects:
2,4-D
Agricultural practices
Agricultural production
Agriculture
Biomass
Buffers
Cover crops
Cropping systems
Crops
Grasses
Herbicides
Nutrients
Planting
Soil nutrients
Soil water
Soybeans
Termination timing
Weeds
Wheat
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Summary: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. Nomenclature: Giant ragweed; Ambrosia trifida L.; waterhemp; Amaranthus tuberculatus (Moq.) Sauer; cereal rye; Secale cereale L.; soybean; Glycine max (L.) Merr.
ISSN:0890-037X
1550-2740
DOI:10.1017/wet.2021.84