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1 September 2014 Soybean ( Glycine max) Tolerance to Timing Applications of Pyroxasulfone, Flumioxazin, and Pyroxasulfone Flumioxazin
Kristen E. McNaughton, Christy Shropshire, Darren E. Robinson, Peter H. Sikkema
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Abstract

Four field studies were conducted over a 3-yr period (2011 to 2013) to determine the tolerance of four soybean cultivars to pyroxasulfone (89 and 178 g ai ha−1), flumioxazin (71 and 142 g ai ha−1), and pyroxasulfone flumioxazin (160 and 320 g ai ha−1) applied either preplant incorporated (PPI), PRE, or at the soybean cotyledon stage (COT). When pyroxasulfone flumioxazin was applied at 160 and 320 g ai ha−1, at the cotyledon stage soybean yield was decreased by 9 and 14%, respectively. The only other treatment that decreased soybean yield was pyroxasulfone (178 g ai ha−1) applied PPI; yield was decreased by 6% despite minimal injury and dry biomass reductions observed during the season. Soybean tolerance to pyroxasulfone or flumioxazin applied alone was generally similar and injury was less than with pyroxasulfone flumioxazin. Similarly, herbicides applied PPI and PRE were less injurious to soybean than the COT timing. Results suggest that soybean is tolerant to PPI and PRE applications of pyroxasulfone flumioxazin but COT applications should be avoided.

Nomenclature: Flumioxazin; pyroxasulfone; soybean, Glycine max (L.) Merr.

Se realizaron cuatro estudios de campo durante un período de 3 años (2011 a 22013) para determinar la tolerancia de cuatro cultivares de soya a pyroxasulfone (89 y 178 g ai ha−1), flumioxazin (71 y 142 g ai ha−1), y pyroxasfulone flumioxazin (160 y 320 g ai ha−1) aplicados ya sea incorporados en presiembra (PPI), PRE, o en el estado cotiledonal de la soya (COT). Cuando se aplicó pyroxasulfone flumioxazin a 160 y 320 g ai ha−1 en el estado cotiledonal, el rendimiento de la soya se redujo en 9 y 14%, respectivamente. El único otro tratamiento que disminuyó el rendimiento de la soya fue pyroxasulfone (178 g ai ha−1) aplicado PPI, en el cual el rendimiento se redujo 6% a pesar de que el daño y reducciones de biomasa seca observados fueron mínimos durante la temporada de crecimiento. La tolerancia de la soya a pyroxasulfone o flumioxazin aplicados solos fue generalmente similar y el daño fue menor que con pyroxasulfone flumioxazin. Similarmente, los herbicidas aplicados PPI y PRE fueron menos dañinos a la soya que al aplicarse COT. Los resultados sugieren que la soya es tolerante a aplicaciones PPI y PRE de pyroxasulfon flumioxazin, pero las aplicaciones COT deberían ser evitadas.

Kristen E. McNaughton, Christy Shropshire, Darren E. Robinson, and Peter H. Sikkema "Soybean ( Glycine max) Tolerance to Timing Applications of Pyroxasulfone, Flumioxazin, and Pyroxasulfone Flumioxazin," Weed Technology 28(3), 494-500, (1 September 2014). https://doi.org/10.1614/WT-D-14-00016.1
Received: 21 February 2014; Accepted: 1 April 2014; Published: 1 September 2014
JOURNAL ARTICLE
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KEYWORDS
Postemergence (POST)
preemergence (PRE)
preplant (PP)
preplant incorporated (PPI)
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