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Miscanthus × giganteus Response to Tillage and Glyphosate

Published online by Cambridge University Press:  20 January 2017

Eric K. Anderson ,
Thomas B. Voigt ,
Germán A. Bollero  and
Aaron G. Hager
Eric K. Anderson
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Thomas B. Voigt
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Germán A. Bollero
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Aaron G. Hager*
Affiliation:
Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61801
*
Corresponding author's E-mail: [email protected]
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Abstract

Miscanthus is a perennial, rhizomatous C4 grass grown in the European Union and studied in the United States as a bioenergy feedstock. U.S. farmers might be more willing to grow this perennial species if methods for its control were established. Experiments were conducted from 2007 to 2009 to evaluate methods to control miscanthus. As glyphosate rate increased from 0 to 3.6 kg ae ha−1 in a greenhouse trial, miscanthus dry weight decreased. Aboveground biomass in the summer following treatments decreased 82, 77, and 95% with fall, spring, and fall followed by spring applications of glyphosate (1.7 kg ae ha−1), respectively, compared with nontreated plots in field experiments. Summer shoot count was reduced by 41% compared with the nontreated control with fall followed by spring glyphosate applications. A second field experiment demonstrated that spring tillage with one or two spring glyphosate applications (2.5 kg ae ha−1 application−1) reduced aboveground dry biomass by 94 and 95%, respectively, and reduced miscanthus shoot number by 38 and 67%, respectively, in the same growing season. These experiments suggest that although glyphosate and tillage can reduce miscanthus biomass, complete control of a mature stand likely will require more than one growing season.

Miscanthus es un zacate C4, perenne, rizomatoso, cultivado en la Unión Europea y estudiado en los Estados Unidos como un forraje bioenergético. Los agricultores de los Estados Unidos estarían más dispuestos a cultivar esta especie perenne si se establecieran métodos para su control. De 2007 a 2009 se realizaron experimentos para evaluar métodos de control de miscanthus. En un estudio en invernadero, al incrementar la dosis de glifosato de 0 a 3.6 kg ea ha−1 el peso seco del miscanthus disminuyó. En el verano, después de los tratamientos, la biomasa de la parte aérea de las plantas disminuyó 82, 77 y 95% con aplicaciones de glifosato (1.7 ea ha−1) en otoño, primavera y otoño seguido de aplicaciones en primavera respectivamente, en comparación con los testigos no tratados, en experimentos de campo. Aplicaciones de glifosato en otoño seguidas de aplicaciones en primavera, redujeron el conteo de tallos en el verano en 41% en comparación con el testigo sin tratar. Un segundo experimento de campo demostró que la labranza en primavera con una o dos aplicaciones de glifosato en la misma estación (2.5 kg ea ha−1 aplicación−1) disminuyó la biomasa seca por encima de la superficie del suelo en 94 y 95%, respectivamente, y redujo el número de tallos de miscanthus en 38 y 67%, respectivamente, en el mismo ciclo de crecimiento. Estos experimentos sugieren que mientras el glifosato y la labranza puedan reducir la biomasa de miscanthus, el control total de una plantación madura probablemente requerirá de más de un ciclo de crecimiento.

Keywords

GlyphosateMiscanthus × giganteus Greef and Deuter ex Hodkinson and RenvoizeBiofuel cropherbicideintegrated pest managementMiscanthus controlperennial grass
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 3 , September 2011 , pp. 356 - 362
Copyright
Copyright © Weed Science Society of America 

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