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The Influence of Adjusting Spray Solution pH on the Efficacy of Saflufenacil

Published online by Cambridge University Press:  20 January 2017

Jared M. Roskamp  and
William G. Johnson
Jared M. Roskamp
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
William G. Johnson*
Affiliation:
Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907
*
Corresponding author's E-mail: wgj@purdue.edu
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Abstract

Saflufenacil solubility and efficacy has been shown to be influenced by carrier water pH. This research was conducted to determine if altering the pH of a solution already containing saflufenacil would influence the efficacy of the herbicide. Saflufenacil at 25 g ai ha−1 was applied to field corn in carrier water with one of five initial pH levels (4.0, 5.2, 6.5, 7.7, or 9.0) and then buffered to one of four final solution pH levels (4.0, 6.5, 9.0, or none) for a total of twenty treatments. All treatments included ammonium sulfate at 20.37 g L−1 and methylated seed oil at 1% v/v. Generally, saflufenacil with a final solution pH of 6.5 or higher provided more dry weight reduction of corn than saflufenacil applied in a final pH of 5.2 or lower. When applying saflufenacil in water with an initial pH of 4.0 or 5.2, efficacy was increased by raising the final solution pH to either 6.5 or 9.0. Conversely, reduction in corn dry weight was less when solution pH of saflufenacil mixed in carrier water with an initial pH of 6.5 or 7.7 was lowered to a final pH of 4.0. When co-applying saflufenacil with herbicides that are very acidic, such as glyphosate, efficacy of saflufenacil may be reduced if solution pH is 5.2 or lower.

Se ha demostrado que la solubilidad y eficacia de saflufenacil son influenciadas por el pH del agua de aplicación. Esta investigación se realizó para determinar si al alterar el pH de una solución que ya contiene saflufenacil podría influir en la eficacia del herbicida. Se aplicó a maíz saflufenacil a 25 g ai ha−1 en agua con uno de cinco niveles de pH inicial (4.0, 5.2, 6.5, 7.7, ó 9.0) y luego se modificó el pH a uno de cuatro niveles de pH final (4.0, 6.5, 9.0, o ninguno), para un total de veinte tratamientos. Todos los tratamientos incluyeron ammonium sulfate a 20.37 g L−1 y aceite metilado de semilla a 1% v/v. Generalmente, saflufenacil con un pH de solución final de 6.5 o mayor brindó una reducción mayor de peso seco del maíz que saflufenacil aplicado a un pH final de 5.2 o menor. Cuando se aplicó saflufenacil en agua con un pH inicial de 4.0 ó 5.2, la eficacia se incrementó al aumentar el pH de la solución final a 6.5 ó 9.0. Contrariamente, la reducción en el peso seco del maíz fue menor cuando el pH de la solución de saflufenacil mezclado con agua con un pH inicial de 6.5 ó 7.7 fue disminuido a un pH final de 4.0. Cuando se co-aplica saflufenacil con herbicidas que son muy ácidos, tales como glyphosate, la eficacia de saflufenacil se podría ver reducida si el pH de la solución es 5.2 o menor.

Keywords

Glyphosatesaflufenacilcorn Zea mays L.ZEMACarrier waterefficacyherbicide
Type
Weed Management—Major Crops
Information
Weed Technology , Volume 27 , Issue 3 , September 2013 , pp. 445 - 447
Copyright
Copyright © Weed Science Society of America 

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