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Weed Suppression in Spring-Sown Rye (Secale cereale)–Pea (Pisum sativum) Cover Crop Mixes

Published online by Cambridge University Press:  20 January 2017

Mary C. Akemo ,
Emilie E. Regnier  and
Mark A. Bennett
Mary C. Akemo
Affiliation:
Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210
Emilie E. Regnier*
Affiliation:
Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210
Mark A. Bennett
Affiliation:
Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210
*
Corresponding author's E-mail: [email protected].
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Abstract

Field trials were conducted with spring-sown rye and field pea cover crops to determine the effect of five rye–pea proportions and three seeding rates (high, medium, and low) on weed suppression during cover crop growth. Measurements on weed and cover crop growth were taken approximately 2 mo after seeding when cover crops were killed. Cover crops were killed by mowing in 1996 and by undercutting in 1997 and 1998. Cover crop biomass, averaged over rye–pea proportion, was highest in 1998 at 4.3 million tons (MT)/ha (high seeding rate) and lowest in 1997 at 1.5 MT/ha (low seeding rate). Cover crops of pure rye or rye–pea mixes suppressed weeds more effectively than did pure pea. Dominant weeds were ladysthumb, smooth pigweed, smallflower galinsoga, and common lambsquarters. Ground cover by weeds ranged from a low of 2% (rye–pea mixes) to a maximum of 73% (pure pea). Cover crop mixes of 50% or more rye seeded at the high rate gave the best weed suppression.

Keywords

Ladysthumb, Polygonum persicaria L. #3 POLPEsmooth pigweed, Amaranthus hybridus L. # AMACHsmallflower galinsoga, Galinsoga parviflora Cav. # GASPAcommon lambsquarters, Chenopodium album L. # CHEALfield pea, Pisum sativum L.rye, Secale cereale L. ‘Wheeler’Allelopathymixed croppingundercuttingAMACHCHEALGASPAPOLPEDASdays after seeding
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 545 - 549
Copyright
Copyright © Weed Science Society of America 

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