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Band sowing with hoeing in organic grains: I. Comparisons with alternative weed management practices in spring barley

Published online by Cambridge University Press:  28 October 2019

Margaret R. McCollough Open the ORCID record for Margaret R. McCollough [Opens in a new window] ,
Eric R. Gallandt Open the ORCID record for Eric R. Gallandt [Opens in a new window] ,
Heather M. Darby  and
Thomas Molloy
Margaret R. McCollough*
Affiliation:
Graduate Student, School of Food and Agriculture, University of Maine, Orono, ME, USA; current: Department of Agroecology, Aarhus University, Slagelse, Denmark
Eric R. Gallandt
Affiliation:
Professor, School of Food and Agriculture, University of Maine, Orono, ME, USA
Heather M. Darby
Affiliation:
Professor, University of Vermont Extension, Burlington, VT, USA
Thomas Molloy
Affiliation:
Research Associate, University of Maine Cooperative Extension, Orono, ME, USA
*
Author for correspondence: Margaret R. McCollough, Department of Agroecology, Aarhus University, Forsøgsvej 1, 4200Slagelse, Denmark. (Email: [email protected])
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Abstract

Weeds remain the foremost production challenge for organic small grain farmers in the northeastern United States. Instead of crops sown in narrow, single-line rows, band sowing offers a more uniform spatial arrangement of the crop, maximizing interspecific while reducing intraspecific competition. Weeds in the inter-band zone are controlled by cultivating with aggressive sweeps; tine harrowing can target weeds in both intra- and inter-band zones. Field experiments in Maine and Vermont in 2016 and 2017 evaluated band sowing for improved weed control, crop yield, and grain quality in organic spring barley (Hordeum vulgare L. ‘Newdale’). Specifically, we compared: (1) the standard practice of sowing 16.5-cm rows at a target crop density of 325 plants m−2, (2) narrow-row sowing with increased crop density, (3) wide-row sowing with interrow hoeing, and (4) band sowing both with and (5) without inter-band hoeing. Mustard (Sinapis alba L. ‘Ida Gold’) was planted throughout the experiment as a surrogate weed. Compared with the standard practice, band sowing with hoeing reduced surrogate weed density on average by 45% across site-years. However, effects on weed biomass and yield were inconsistent, perhaps due to suboptimal timing of hoeing and adverse weather conditions. In 1 out of 4 site-years, band sowing with hoeing reduced surrogate weed biomass by 67% and increased crop yield compared with the standard treatment. Results also indicate that band sowing with hoeing may improve 1,000-kernel weight and plump kernel grain-quality parameters.

Keywords

Cerealcrop–weed competitiongraininterrow hoeingnarrow-rowphysical weed controlsmall grainwide-row
Type
Research Article
Information
Weed Science , Volume 68 , Issue 3 , May 2020 , pp. 285 - 293
Copyright
© Weed Science Society of America, 2020

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