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Rice Crop Response to Simulated Drift of Imazamox

  • Eric P. Webster (a1), Justin B. Hensley (a1), David C. Blouin (a2), Dustin L. Harrell (a3) and Jason A. Bond (a4)...

Abstract

Field studies were conducted near Crowley, LA, to evaluate the effects of simulated herbicide drift on ‘Cocodrie' rice. Each treatment was made with the spray volume varying proportionally to herbicide dosage based on a spray volume of 234 L ha−1 and an imazamox rate of 44 g ai ha−1. The 6.3%, 2.7-g ha−1, herbicide rate was applied at a spray volume of 15 L ha−1 and the 12.5%, 5.5-g ha−1, herbicide rate was applied at a spray volume of 29 L ha−1. Rice was treated at the one-tiller, panicle differentiation, boot, and physiological maturity growth stages. Injury was observed with imazamox applied at the one-tiller timing. Injury was not observed until 21 and 28 d after treatment (DAT) when imazamox was applied at the panicle differentiation and boot timings. The greatest reduction in plant height resulted from applications at the one-tiller timing at 7 and 14 DAT; however, when evaluated at harvest, plant height was reduced no more than 10%. Imazamox, averaged over rate, applied to rice at the boot timing reduced primary crop yield 66% compared with the nontreated. Applications at the boot timing resulted in an increased ratoon crop yield; however, the yield increase did not compensate for the loss in the primary crop yield.

Estudios de campo fueron realizados cerca de Crowley, Louisiana, para evaluar los efectos de la deriva simulada de herbicidas en el arroz 'Cocodrie'. Cada tratamiento fue hecho con un volumen de aspersión que se varió proporcionalmente a la dosis del herbicida con base en un volumen de aspersión de 234 L ha−1 y una dosis de imazamox de 44 g ai ha−1. La dosis de herbicida de 6.3%, 2.7 g ha−1, fue aplicada con un volumen de aspersión de 15 L ha−1. y la dosis de 12.5%, 5.5 g ha−1, fue aplicada con un volumen de aspersión de 29 L ha−1. El arroz fue tratado en los estadios de crecimiento de un hijuelo, diferenciación de panícula, emergencia de tallo floral, y madurez fisiológica. Se observó daño con imazamox aplicado en el estadio de un hijuelo. No se observo daño hasta 21 y 28 d después del tratamiento (DAT) cuando imazamox fue aplicado en los estadios de diferenciación de panícula y de emergencia de tallo floral. La mayor reducción en la altura de las plantas se debió a aplicaciones en el estadio de un hijuelo a 7 y 14 DAT. Sin embargo, cuando se evaluó en el momento de la cosecha, la altura de planta se redujo en no más de 10%. Imazamox, promediando las dosis, aplicado al arroz en el momento de la emergencia del tallo floral, redujo el rendimiento del cultivo primario 66% comparado con el testigo sin tratamiento. Las aplicaciones al momento de la emergencia del tallo floral resultaron en un incremento en el rendimiento de la soca. Sin embargo, el aumento del rendimiento no compensó la pérdida de rendimiento del cultivo primario.

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Corresponding author

Corresponding author's E-mail: ewebster@agcenter.lsu.edu.

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Associate Editor for this paper: William Johnson: Purdue University.

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References

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Rice Crop Response to Simulated Drift of Imazamox

  • Eric P. Webster (a1), Justin B. Hensley (a1), David C. Blouin (a2), Dustin L. Harrell (a3) and Jason A. Bond (a4)...

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