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Impact of Herbicides and Application Timing on Weed Control, Yield, and Nutritive Value of Tall Fescue Pastures and Hayfields

Published online by Cambridge University Press:  20 January 2017

Kristin K. Payne ,
Byron B. Sleugh  and
Kevin W. Bradley
Kristin K. Payne
Affiliation:
Division of Plant Sciences, 205 Waters Hall, University of Missouri, Columbia, MO 65202
Byron B. Sleugh
Affiliation:
Dow AgroSciences, LLC, Indianapolis, IN 46268
Kevin W. Bradley*
Affiliation:
Division of Plant Sciences, 201 Waters Hall, University of Missouri, Columbia, MO 65202
*
Corresponding author's E-mail: [email protected].
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Abstract

Field experiments were conducted from 2007 through 2009 at four locations in Missouri to evaluate the effect of May and August herbicide applications on weed control, total biomass yield, and forage nutritive values. Experiments were conducted in established tall fescue pastures that contained natural infestations of common ragweed and tall ironweed. Treatments consisted of 2,4-D, metsulfuron, aminopyralid, 2,4-D + dicamba, 2,4-D + picloram, aminopyralid + 2,4-D, and 2,4-D + dicamba + metsulfuron. All herbicide treatments provided > 76% control of common ragweed 1 mo after treatment (MAT), except metsulfuron alone which provided ≤ 62% control. August applications provided greater reductions in common ragweed density than May applications the following spring. Few differences in tall ironweed density were observed, but metsulfuron-containing herbicides tended to provide the lowest reduction in tall ironweed stem density the following spring. Biomass yields were generally greater in nontreated compared to herbicide-treated plots. Crude protein (CP) concentration and relative feed value (RFV) were higher in nontreated compared with herbicide-treated biomass. Overall, the poorer nutritive values and lower biomass yields in the herbicide-treated compared with the nontreated biomass may be partially explained by the removal of common ragweed, tall ironweed, and legumes with the herbicide treatments. Pure samples of common ragweed and white clover were greater in nutritive values than pure samples of tall fescue at all June harvests. Results indicate that common ragweed offers nutritive values equivalent to or greater than tall fescue and white clover when harvested in June at the vegetative stage of growth and that the removal of common ragweed and tall ironweed with herbicide applications is not likely to improve forage nutritive values of the total harvested biomass of tall fescue pastures, at least by the season after treatment.

De 2007 a 2009 se realizaron experimentos de campo en cuatro sitios en Missouri para evaluar el efecto de la aplicación de herbicidas en mayo y agosto en el control de la maleza, el rendimiento total de la biomasa y los valores nutricionales del forraje. Los experimentos se llevaron al cabo en praderas establecidas con Lolium arundinacea que contenían infestaciones naturales de Ambrosia artemisiifolia y Vernonia gigantea. Los tratamientos consistieron en 2,4-D, metsulfurón, aminopyralid, 2,4-D + dicamba, 2,4-D + picloram, aminopyralid + 2,4-D y 2,4-D + dicamba + metsulfurón. Todos los tratamientos de herbicida proporcionaron un control de la Ambrosia artemisiifolia, mayor al 76%, un mes después del tratamiento (MAT), exceptuando al metsulfurón aplicado por sí solo, el cual proporcionó ≤ 62% de control. Las aplicaciones en agosto dieron como resultado mayores reducciones en la densidad de Ambrosia artemisiifolia que las aplicaciones de mayo, en la primavera siguiente. Se observaron pocas diferencias en la densidad de Vernonia gigantea, pero los herbicidas que contenían metsulfurón tendieron a proporcionar la más baja reducción en la densidad del tallo de la maleza mencionada, la primavera siguiente. Los rendimientos de biomasa fueron generalmente mayores en las parcelas no tratadas, comparadas con las que sí fueron tratadas con herbicidas. La concentración de proteína cruda (CP) y el valor alimenticio relativo (RFV) fueron más altos en los testigos no tratados comparados con la biomasa tratada con herbicida. En general, los valores nutricionales y de rendimiento de la biomasa mas bajos observados en los cultivos tratados con herbicida, comparados con los que no lo fueron, podrían ser parcialmente explicados por la remoción de la Ambrosia artemisiifolia, Vernonia gigantea y leguminosas con tratamiento de herbicida. Muestras puras de Ambrosia artemisiifolia y Trifolium repens, fueron mejores en valores nutricionales que las muestras puras de Lolium arundinacea, en todas las cosechas de junio. Los resultados indican que Ambrosia artemisiifolia ofrece valores nutricionales equivalentes o mayores que Lolium arundinacea y Trifolium repens, cuando ésta se cosecha en junio en el estado vegetativo de crecimiento, y que la remoción de Ambrosia artemisiifolia y Vernonia gigantea con aplicaciones de herbicida, probablemente no mejore los valores nutricionales del total de la biomasa cosechada de pasturas de Lolium arundinacea, al menos para la estación posterior al tratamiento.

Keywords

Aminopyralid2,4-D, dimethylamine salt of 2,4-Ddicambametsulfuronpicloramcommon ragweed, Ambrosia artemisiifolia L., AMBELtall ironweed, Vernonia gigantea (Walt.) Trel, VENALtall fescue, Lolium arundinaceum (Schreb.) S.J. Darbyshire, FESARNutritive valuebiomass yieldherbicide applicationscrude proteinrelative feed value
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 24 , Issue 4 , December 2010 , pp. 515 - 522
Copyright
Copyright © Weed Science Society of America 

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