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Influence of a Rye Cover Crop on the Critical Period for Weed Control in Cotton

Published online by Cambridge University Press:  20 January 2017

Nicholas E. Korres  and
Jason K. Norsworthy
Nicholas E. Korres*
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
Jason K. Norsworthy
Affiliation:
Department of Crop, Soil, and Environmental Sciences, University of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
*
Corresponding author's E-mail: [email protected]
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Abstract

Cover crops are becoming increasingly common in cotton as a result of glyphosate-resistant Palmer amaranth; hence, a field experiment was conducted in 2009 and 2010 in Marianna, AR, with a rye cover crop used to determine its effects on the critical period for weed control in cotton. Throughout most of the growing season, weed biomass in the presence of a rye cover crop was lesser than that in the absence of a rye cover crop. In 2009, in weeks 2 through 7 after planting, weed biomass was reduced at least twofold in the presence of a rye cover compared with the absence of rye. In 2009, in both presence and absence of a rye cover crop, weed removal needed to begin before weed biomass was 150 g m−2, or approximately 4 wk after planting, to prevent yield loss > 5%. Weed density was less in 2010 than in 2009, so weed removal was not required until 7 wk after planting, at which point weed biomass values were 175 and 385 g m−2 in the presence and absence of a cover crop, respectively.

Keywords

Glyphosate, N-(phosphonomethyl)glycinePalmer amaranth, Amaranthus palmeri (S.) Wats. AMAPAcereal rye, Secale cereale L. ‘Wrens Abruzzi’cotton, Gossypium hirsutum L. ‘Stoneville 4554 B2RF’.Cereal rye covercover cropscultural weed controlnonchemical weed controlresidue coverweed suppression
Type
Weed Management
Information
Weed Science , Volume 63 , Issue 1 , March 2015 , pp. 346 - 352
Copyright
Copyright © Weed Science Society of America 

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