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Niger Tolerance to Flucarbazone

Published online by Cambridge University Press:  20 January 2017

William E. May*
Affiliation:
Indian Head Research Farm, Agriculture and Agri-Food Canada, RR#1 Government Road, P. O. Box 760, Indian Head, Saskatchewan, S0G 2K0, Canada
*
Corresponding author's E-mail: william.may@agr.gc.ca.

Abstract

Niger is a potential crop for the Northern Great Plains, but not until volunteer canola can be controlled. A study at Indian Head, SK, was conducted from 2007 to 2009 to determine the tolerance of niger to flucarbazone, a herbicide that controls volunteer canola. The tolerance was determined by applying three rates of flucarbazone (19, 28.5, and 38 g ai ha−1) at four application stages (two, four, six, and eight-leaf stage). Mean injury did not exceed 22% for any year by treatment combination. Injury was most prominent in 2007, and dissipated as the growing season progressed. Increasing the rate of flucarbazone increased crop injury depending on the year, application timing, and evaluation timing. Injury under 20% in 2007 and under 10% in 2008 and 2009 was observed at the start of flowering when flucarbazone was applied at the two, four, and six-leaf stage. Injury from applications at the two, four, and six-leaf stage decreased as the growing season progressed. When the labelled rate of flucarbazone for wheat (19 g ha−1) was applied at the two, four, or six leaf stage, injury was below 10%. Injury when flucarbazone was applied at the eight-leaf stage was highest during seed filling. Volunteer canola was controlled by flucarbazone. The application of flucarbazone relative to a weedy control increased yield by about 50% (138 to 213 kg ha−1) in 2008 and 2009. Flucarbazone rate did not affect niger yield except in 2007 where yield was about 100 kg ha−1 less with the two highest rates. Delaying flucarbazone application decreased niger yield, especially in the year (2007) with most niger injury. Flucarbazone application at the two- or four-leaf niger stage at a rate of 19 g ha−1 provided a good balance of weed control and crop tolerance.

Níger es un cultivo potencial para las Grandes Planicies del Norte, pero esto dependerá del control la colza voluntaria. En Indian Head, Saskatchewan, se realizó un estudio entre 2007 y 2009, para determinar la tolerancia de níger a flucarbazone, un herbicida que controla la colza voluntaria. La tolerancia se determinó aplicando tres dosis de flucarbazone (19, 28.5, y 38 g ai ha−1) en cuatro estadios de crecimiento (dos, cuatro, seis, y ocho hojas). El daño promedio no excedió 22% en ninguno de los años para cualquiera de las combinaciones de tratamientos. El daño fue más prominente en 2007, y se disipó conforme la temporada de crecimiento avanzó. El incremento en la dosis de flucarbazone aumentó el daño en el cultivo dependiendo del año, el momento de aplicación, y el momento de evaluación. Niveles de daño por debajo de 20% en 2007 y de 10% en 2008 y 2009, fueron observados al inicio de la floración cuando flucarbazone fue aplicado en los estadios de dos, cuatro, y seis hojas. El daño generado por aplicaciones en los estadios de dos, cuatro, y seis hojas disminuyó al avanzar la temporada de crecimiento. Cuando se aplicó la dosis de etiqueta de flucarbazone para trigo (19 g ai ha−1) en los estadios de dos, cuatro, o seis hojas, el daño fue inferior a 10%. El daño de flucarbazone aplicado en el estadio de ocho hojas fue más alto durante el llenado de la semilla. La colza voluntaria fue controlada por flucarbazone. La aplicación de flucarbazone, en relación al testigo con malezas, aumentó el rendimiento en cerca de 50% (138 a 213 kg ha−1) en 2008 y 2009. La dosis de flucarbazone no afectó el rendimiento del níger, excepto en 2007 cuando el rendimiento fue cerca de 100 kg ha−1 menor con las dos dosis más altas. El retrasar la aplicación de flucarbazone disminuyó el rendimiento del níger, especialmente en el año (2007) con mayor daño en el cultivo. La aplicación de flucarbazone en los estadios de dos o cuatro hojas a una dosis de 19 g ai ha−1 brindó un buen balance entre el control de malezas y la tolerancia del cultivo.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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References

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