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Weed Management in Conventional- and No-Till Soybean Using Flumioxazin/Pyroxasulfone

Published online by Cambridge University Press:  20 January 2017

Kris J. Mahoney ,
Christy Shropshire  and
Peter H. Sikkema
Kris J. Mahoney*
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON N0P 2C0, Canada
Christy Shropshire
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON N0P 2C0, Canada
Peter H. Sikkema
Affiliation:
Department of Plant Agriculture, University of Guelph Ridgetown Campus, 120 Main Street East, Ridgetown, ON N0P 2C0, Canada
*
Corresponding author's E-mail: kmahoney@uoguelph.ca.
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Abstract

Eleven field experiments were conducted over a 3-yr period (2010, 2011, and 2012) in conventional- and no-till soybean with a flumioxazin and pyroxasulfone premix. PRE and preplant applications were evaluated for soybean injury, weed control, and yield compared to standard herbicides. Early-season soybean injury from flumioxazin/pyroxasulfone ranged from 1 to 19%; however, by harvest, soybean yields were similar across labeled rates (160 and 200 g ai ha−1), standard treatments, and the nontreated control. Flumioxazin/pyroxasulfone provided excellent control (99 to 100%) of velvetleaf, pigweed species (redroot pigweed and smooth pigweed), and common lambsquarters across almost all rates tested (80 to 480 g ai ha−1). Common ragweed, green foxtail, and giant foxtail control increased with flumioxazin/pyroxasulfone rate. The biologically effective rates varied between tillage systems. The flumioxazin/pyroxasulfone rate required to provide 80% control (R80) of pigweed was 3 and 273 g ai ha−1 under conventional- and no-till, respectively. For common ragweed, the R80 was 158 g ai ha−1 under conventional tillage; yet, under no-till, the rate was nonestimable. The results indicate that flumioxazin/pyroxasulfone can provide effective weed control as a setup for subsequent herbicide applications.

Durante un período de 3 años (2010, 2011, y 2012), se realizaron once experimentos de campo usando pre-mezclas de flumioxazin y pyroxasulfone en soya con labranza convencional y cero labranza. Se evaluó el efecto de aplicaciones PRE y pre-siembra en el daño de la soya, el control de malezas, y el rendimiento en comparación con herbicidas estándar. El daño de la soya, temprano durante la temporada de crecimiento, producto de flumioxazin/pyroxasulfone varió entre 1 y 19%. Sin embargo, al momento de la cosecha, los rendimientos de la soya fueron similares al compararse las dosis de etiqueta (160 y 200 g ai ha−1), los tratamientos estándar, y el testigo sin tratamiento. Flumioxazin/pyroxasulfone brindó excelente control (99 a 100%) de Abutilon theophrasti, Amaranthus retroflexus, Amaranthus hybridus, y Chenopodium album en casi todas las dosis evaluadas (80 a 480 g ai ha−1). El control de Ambrosia artemisiifolia, Setaria viridis, y Setaria faberi aumentó con la dosis de flumioxazin/pyroxasulfone. Las dosis biológicamente efectivas fueron diferentes según el sistema de labranza. La dosis de flumioxazin/pyroxasulfone requerida para brindar 80% de control (R80) de Amaranthus spp. fue 3 y 273 g ai ha−1 en labranza convencional y en labranza cero, respectivamente. Para A. artemisiifolia, la R80 fue 158 g ai ha−1 en labranza convencional, aunque en labranza cero, la dosis no fue estimable. Los resultados indican que flumioxazin/pyroxasulfone puede brindar un control inicial de malezas efectivo que sirva de base para aplicaciones subsecuentes de otros herbicidas.

Keywords

Flumioxazinpyroxasulfonecommon lambsquarters, Chenopodium album L.common ragweed, Ambrosia artemisiifolia L.giant foxtail, Setaria faberi Herrm.green foxtail, Setaria viridis (L.) Beauv.redroot pigweed, Amaranthus retroflexus L.smooth pigweed, Amaranthus hybridus L.velvetleaf, Abutilon theophrasti Medik.soybean, Glycine max (L.) Merr.Biologically effective ratepreplant herbicidespreemergence herbicidessoybean yieldweed control
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 2 , June 2014 , pp. 298 - 306
Copyright
Copyright © Weed Science Society of America 

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