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On a Method of Analysis for Synergistic and Antagonistic Joint-Action Effects with Fenoxaprop Mixtures in Rice (Oryza sativa)

  • David C. Blouin (a1), Eric P. Webster (a2) and Jason A. Bond (a3)


Presented and illustrated is an easy-to-implement and flexible methodology for the analysis of synergistic and antagonistic effects when the effects are defined as nonlinear functions of means. The methodology augments standard mixed-model analyses with the Delta method for standard errors of nonlinear functions of means. Explained is why standard ANOVA methods that have been adopted in the literature are not recommended. To illustrate the methodology, the joint-action effects of fenoxaprop with companion herbicides in two-component mixtures for weed control in rice were evaluated. The companion herbicides were halosulfuron, bispyribac-sodium, bensulfuron, penoxsulam, carfentrazone, quinclorac, and imazethapyr. Weeds evaluated were barnyardgrass and broadleaf signalgrass. Experiments in Louisiana and Mississippi in 2009 revealed a preponderance of antagonistic effects. The analysis showed that mixtures with bispyribac-sodium, penoxsulam, quinclorac, and imazethapyr were generally the most antagonistic and provided the least control.

A continuación se presenta e ilustra una metodología flexible y fácil de implementar para el análisis de efectos sinergéticos y antagónicos cuando éstos están definidos como funciones no lineales de los medios. La metodología complementa los análisis estándar de modelo mixto con el método Delta para errores estándar de funciones no lineales de los medios. Se pretende explicar por qué no se recomiendan los métodos estándar de análisis de variancia que han sido adoptados en la literatura. Para ilustrar esta metodología se evaluaron los efectos de acción conjunta del fenoxaprop con otros herbicidas en las mezclas de dos componentes para el control de las malezas en el cultivo de Oryza sativa L. Los herbicidas combinados con fenoxaprop fueron halosulfuron, sodio-bispyribac, bensulfuron, penoxsulam, carfentrazone, quinclorac, e imazethapyr. Las malezas evaluadas fueron Echinocholoa crus-galli L. Beauv. ECHCG y Urochloa platyphylla (Nash) R.D. Webster BRAPP. Los experimentos en Luisiana y Mississipi en 2009 revelaron una preponderancia de efectos antagónicos. El análisis mostró que las mezclas con sodio-bispyribac, penoxsulam, quinclorac, e imazethapyr fueron generalmente los más antagónicos y proporcionaron el menor control.


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On a Method of Analysis for Synergistic and Antagonistic Joint-Action Effects with Fenoxaprop Mixtures in Rice (Oryza sativa)

  • David C. Blouin (a1), Eric P. Webster (a2) and Jason A. Bond (a3)


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