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Effect of Postemergence Mesotrione Application Timing on Grain Sorghum

Published online by Cambridge University Press:  20 January 2017

M. Joy M. Abit
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Kassim Al-Khatib
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Randall S. Currie
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Phillip W. Stahlman
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Patrick W. Geier
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Barney W. Gordon
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Brian L. S. Olson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Mark M. Claassen
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
David L. Regehr
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Corresponding
E-mail address:

Abstract

Field experiments were conducted at Belleville, Colby, Hays, Hesston, Garden City, and Manhattan, KS, to determine grain sorghum response to POST application of mesotrione at three application timings. Mesotrione was applied at 52, 105, 157, and 210 g ai/ha in combination with 280 g ai/ha atrazine to grain sorghum at heights of 5 to 8, 15 to 20, and 30 cm, which correspond to early POST (EPOST), mid-POST (MPOST), and late POST (LPOST), respectively. All mesotrione rates caused injury at all application timings. Overall, grain sorghum injury from mesotrione was greatest at 1 wk after treatment (WAT); plants partially recovered from injury by 4 WAT. Mesotrione applied EPOST injured grain sorghum more than when applied at MPOST and LPOST timings. The EPOST application injured grain sorghum 19 to 88%, whereas injury from MPOST and LPOST application was 1 to 66% and 0 to 69%, respectively, depending on rate. Mesotrione injury was least at Belleville and most at the Hesston and Garden City (irrigated) sites regardless of growth stage. Correlation coefficient analyses indicated that observed mesotrione injury symptoms were not well correlated with grain sorghum yield; thus, mesotrione injury to grain sorghum did not influence grain yield. However, initial grain sorghum injury was severe, and this will likely be a major concern to producers.

Se condujeron experimentos de campo en Belleville, Colby, Hays, Hesston, Garden City y Manhattan, KS para determinar la respuesta de aplicaciones post-emergentes en sorgo de grano de mesotrione en 3 intervalos de aplicación. El mesotrione fue aplicado en dosis de 52, 105, 157 y 210 g ia/ha en combinación con 280 g ia/ha de atrazine en etapas de crecimiento de 5 a 8 cm., de 15 a 20 cm y de 30 cm, las cuales corresponden a la emergencia temprana (EPOST), emergencia media (MPOST) y emergencia tardía (LPOST) respectivamente. Todas las dosis de mesotrione causaron daño en todos los intervalos de aplicación. De todos los tratamientos el que mayor daño causó al sorgo de grano fue el de mesotrione aplicado una semana después del tratamiento (1 WAT), las plantas se recuperaron parcialmente de los daños a las 4 semanas después del tratamiento (4 WAT). La aplicación temprana de mesotrione (EPOST) causó más daño al sorgo que cuando fue aplicado en la emergencia media (MPOST) y la emergencia tardía. La aplicación temprana dañó el sorgo de un 19% a un 88% mientras que el daño en la emergencia media y emergencia tardía fue de un 1% a un 66% y de un 0 % a un 69% respectivamente, dependiendo de la dosis. El menor daño causado por mesotrione ocurrió en Belleville y el mayor en Hesston y Garden City, ambos sitios irrigados, independientemente de la etapa de crecimiento. El análisis del coeficiente de correlación indicó que los daños observados por la aplicación de mesotrione no fueron bien correlacionados con los rendimientos del sorgo, mientras que el daño de mesotrione no incluyó los rendimientos del grano. Sin embargo, el daño inicial fue severo, y esto será probablemente una preocupación importante para los productores de sorgo.

Type
Weed Management—Major Crops
Copyright
Copyright © Weed Science Society of America 

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