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Dissipation and Leaching of Pyroxasulfone and S-Metolachlor

Published online by Cambridge University Press:  20 January 2017

Eric P. Westra ,
Dale L. Shaner ,
Philip H. Westra  and
Phillip L. Chapman
Eric P. Westra*
Affiliation:
Department of Soil and Crop Sciences, Colorado State University, Fort Collins, CO 80523
Dale L. Shaner
Affiliation:
USDA-ARS Water Management Unit, Fort Collins, CO 80526
Philip H. Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Phillip L. Chapman
Affiliation:
Department of Statistics, Colorado State University, Fort Collins, CO 80523
*
Corresponding author's E-mail: [email protected].
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Abstract

Pyroxasulfone dissipation and mobility in the soil was evaluated and compared to S-metolachlor in 2009 and 2010 at two field sites in northern Colorado, on a Nunn fine clay loam, and Olney fine sandy loam soil. Pyroxasulfone dissipation half-life (DT50) values varied from 47 to 134 d, and those of S-metolachlor ranged from 39 to 63 d. Between years, herbicide DT50 values were similar under the Nunn fine clay loam soil. Under the Olney fine sandy loam soil, dissipation in 2009 was minimal under dry soil conditions. In 2010, under the Olney fine sandy loam soil, S-metolachlor and pyroxasulfone had half-lives of 39 and 47 d, respectively, but dissipation rates appeared to be influenced by movement of herbicides below 30 cm. Herbicide mobility was dependent on site-year conditions, in all site-years pyroxasulfone moved further downward in the soil profile compared to S-metolachlor.

La disipación y movilidad de pyroxasulfone en el suelo fueron evaluadas y comparadas con las de S-metolachlor en 2009 y 2010 en dos campos en el Norte de Colorado, en un suelo Nunn franco arcilloso fino y un suelo Olney franco arenoso fino. Los valores de vida media de disipación (DT50) de pyroxasulfone variaron entre 47 y 134 d, y de S-metolachlor entre 39 y 63 d. Entre años, los valores DT50 de los herbicidas fueron similares en el suelo Nunn franco arcilloso fino. Mientras que en el suelo Olney franco arenoso fino, la disipación en 2009 fue mínima bajo condiciones de suelo seco. En 2010 en el suelo Olney franco arenoso fino, S-metolachlor y pyroxasulfone tuvieron vidas medias de 39 a 47 d, respectivamente, pero las tasas de disipación parecieron ser influenciadas por el movimiento de los herbicidas debajo de los 30 cm de profundidad. La movilidad de los herbicidas dependió de las condiciones sitio-año, y en todos los sitios-año pyroxasulfone se movió a mayor profundidad que S-metolachlor dentro del perfil del suelo.

Keywords

PyroxasulfoneS-metolachlorDissipationmobilityirrigation
Type
Research Article
Information
Weed Technology , Volume 28 , Issue 1 , March 2014 , pp. 72 - 81
Copyright
Copyright © Weed Science Society of America 

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