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Using Reduced Tillage and Cover Crop Residue to Manage Weeds in Organic Vegetable Production

Published online by Cambridge University Press:  03 July 2017

Guihua Chen ,
Lauren Kolb ,
Alan Leslie  and
Cerruti R. R. Hooks
Guihua Chen*
Affiliation:
Postdoctoral Research Associate, Department of Entomology, University of Maryland, College Park, MD 20742.
Lauren Kolb
Affiliation:
Postdoctoral Research Associate, Department of Entomology, University of Maryland, College Park, MD 20742.
Alan Leslie
Affiliation:
Postdoctoral Research Associate, Department of Entomology, University of Maryland, College Park, MD 20742.
Cerruti R. R. Hooks
Affiliation:
Associate Professor and Extension Specialist, Department of Entomology, University of Maryland, College Park, MD 20742.
*
*Corresponding author’s E-mail: [email protected]
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Abstract

Adoption of conservation tillage practices has been slow in organic vegetable production, partially due to producers’ concerns regarding weed management. Integrating cover crops into a conservation tillage program may provide organic producers a viable weed management option enabling growers to practice conservation tillage. A four-year study was conducted to evaluate the influence of different tillage methods (two conventional and two conservation practices) jointly with a mixed winter cover crop for weed suppression, time required for hand weeding, and crop yield in organically managed eggplant (2012 and 2014) and sweet corn (2013 and 2015) production systems. Tillage treatments were conventional tillage without surface mulch (CT-BG) and with black polyethylene (plastic) mulch (CT-BP), strip-tillage (ST), and no-tillage (NT) with cover crop residue. At 2 and 7 WAT/P (weeks after transplanting/planting), intra-row weed density was higher in CT-BG and ST, and inter-row weed density was higher in CT-BG and CT-BP treatments. Time required for hand-weeding was greatest in CT-BG and least in CT-BP and NT treatments. Eggplant yield was lowest in NT treatment in 2012 but similar among treatments in 2014. Sweet corn yield was similar among treatments in 2013 but highest in ST in 2015. Though both CT-BP and NT treatments showed greater potential for weed suppression, production input was highest in CT-BP but least in NT. Implications of these findings suggest that there is a potential to use strip tillage integrating with stale seedbed tactic for weed management in organic vegetables, which reduces herbicide use, hand-labor, and overall weed management cost while maintaining high yield potential.

Keywords

Broadleaf plantain, Plantago major L. PLAMA; carpetweed, Mollugo verticillata L. MOLVE; goosegrass, Eleusine indica (L.) Gaertn. ELEIN; large crabgrass, Digitaria sanguinalis (L.) Scop. DIGSA; smooth crabgrass, Digitaria ischaemum (Schreb.) Schreb. ex Muhl. DIGIS.Conservation tillageconventional tillagecover croporganic vegetable productionweed density.
Type
Weed Management-Other Crops/Areas
Information
Weed Technology , Volume 31 , Issue 4 , August 2017 , pp. 557 - 573
Copyright
© Weed Science Society of America, 2017 

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Footnotes

a

Current address of second author: The City of Boulder’s Open Space and Mountain Parks, Boulder, CO 80303

Associate Editor for this paper: Darren Robinson, University of Guelph.

References

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