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Investigating tarps to facilitate organic no-till cabbage production with high-residue cover crops

Published online by Cambridge University Press:  26 September 2018

Natalie P Lounsbury Open the ORCID record for Natalie P Lounsbury [Opens in a new window] ,
Nicholas D Warren ,
Seamus D Wolfe  and
Richard G Smith
Natalie P Lounsbury*
Affiliation:
Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire, USA
Nicholas D Warren
Affiliation:
Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire, USA
Seamus D Wolfe
Affiliation:
Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire, USA
Richard G Smith
Affiliation:
Department of Natural Resources and the Environment, University of New Hampshire, Durham, New Hampshire, USA
*
Author for correspondence: Natalie P. Lounsbury, E-mail: [email protected]
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Abstract

High-residue cover crops can facilitate organic no-till vegetable production when cover crop biomass production is sufficient to suppress weeds (>8000 kg ha−1), and cash crop growth is not limited by soil temperature, nutrient availability, or cover crop regrowth. In cool climates, however, both cover crop biomass production and soil temperature can be limiting for organic no-till. In addition, successful termination of cover crops can be a challenge, particularly when cover crops are grown as mixtures. We tested whether reusable plastic tarps, an increasingly popular tool for small-scale vegetable farmers, could be used to augment organic no-till cover crop termination and weed suppression. We no-till transplanted cabbage into a winter rye (Secale cereale L.)-hairy vetch (Vicia villosa Roth) cover crop mulch that was terminated with either a roller-crimper alone or a roller-crimper plus black or clear tarps. Tarps were applied for durations of 2, 4 and 5 weeks. Across tarp durations, black tarps increased the mean cabbage head weight by 58% compared with the no tarp treatment. This was likely due to a combination of improved weed suppression and nutrient availability. Although soil nutrients and biological activity were not directly measured, remaining cover crop mulch in the black tarp treatments was reduced by more than 1100 kg ha−1 when tarps were removed compared with clear and no tarp treatments. We interpret this as an indirect measurement of biological activity perhaps accelerated by lower daily soil temperature fluctuations and more constant volumetric water content under black tarps. The edges of both tarp types were held down, rather than buried, but moisture losses from the clear tarps were greater and this may have affected the efficacy of clear tarps. Plastic tarps effectively killed the vetch cover crop, whereas it readily regrew in the crimped but uncovered plots. However, emergence of large and smooth crabgrass (Digitaria spp.) appeared to be enhanced in the clear tarp treatment. Although this experiment was limited to a single site-year in New Hampshire, it shows that use of black tarps can overcome some of the obstacles to implementing cover crop-based no-till vegetable productions in northern climates.

Keywords

Mulch decompositionno-till vegetablesoccultationroller-crimpersmall-scale no-tillsolarizationweed suppression
Type
Preliminary Report
Information
Renewable Agriculture and Food Systems , Volume 35 , Issue 3 , June 2020 , pp. 227 - 233
Copyright
Copyright © Cambridge University Press 2018

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