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1 April 2014 Weed Management in Conventional- and No-Till Soybean Using Flumioxazin/Pyroxasulfone
Kris J. Mahoney, Christy Shropshire, Peter H. Sikkema
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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.

Nomenclature: Flumioxazin; pyroxasulfone; common 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.

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 con

Kris J. Mahoney, Christy Shropshire, and Peter H. Sikkema "Weed Management in Conventional- and No-Till Soybean Using Flumioxazin/Pyroxasulfone," Weed Technology 28(2), 298-306, (1 April 2014).
Received: 13 August 2013; Accepted: 1 November 2013; Published: 1 April 2014
biologically effective rate
preemergence herbicides
preplant herbicides
soybean yield
weed control
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