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Effect of Temperature and Moisture on Aminocyclopyrachlor Soil Half-Life

Published online by Cambridge University Press:  20 January 2017

Katie L. Conklin  and
Rodney G. Lym
Katie L. Conklin
Affiliation:
Plant Sciences Department, North Dakota State University, Fargo, ND 58105
Rodney G. Lym*
Affiliation:
Plant Sciences Department, North Dakota State University, Fargo, ND 58105
*
Corresponding author's E-mail: [email protected]
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Abstract

Aminocyclopyrachlor will control a variety of invasive weeds but may injure sensitive plant species if seeded into treated soil too soon after application. Aminocyclopyrachlor 50% dissipation time (DT50) ranged from 3 to > 112 d in four soils from the Northern Great Plains. The DT50 was dependent on several factors including soil type, moisture content, and temperature. Across four different soil textures, aminocyclopyrachlor dissipation generally increased as soil moisture content increased, but moisture had less of an impact in sandy soils. Aminocyclopyrachlor dissipation also increased as temperature increased in the four soils. The most rapid dissipation occurred in soils with higher clay content, which also had the highest organic matter content of the soils evaluated, and an average DT50 of less than 20 d. Seeding sensitive pasture, range, or crop species after aminocyclopyrachlor applications should be done with caution since the herbicide has potential for long persistence in the soil.

Aminocyclopyrachlor controlará varias malezas invasivas, pero podría dañar especies de plantas sensibles si estas son sembradas en suelo tratado poco tiempo después de la aplicación. El tiempo de disipación del 50% de aminocyclopyrachlor (DT50) varió entre 3 y >112 días en cuatro suelos de las Grandes Planicies del Norte. El DT50 fue dependiente de varios factores incluyendo tipo de suelo, contenido de humedad, y temperatura. En las cuatro diferentes texturas de suelo, la disipación de aminocyclopyrachlor generalmente aumentó al incrementar el contenido de humedad del suelo, pero la humedad tuvo un impacto menor en suelos arenosos. La disipación de aminocyclopyrachlor también aumentó al incrementarse la temperatura en los cuatro suelos. La disipación más rápida, con un DT50 promedio de menos de 20 días, ocurrió en suelos con mayor contenido de arcilla, los cuales también tuvieron los mayores contenidos de materia orgánica en los suelos evaluados. La siembra de pastos, especies silvestres, o cultivos sensibles después de aplicaciones de aminocyclopyrachlor deberían realizarse con precaución en vista de que este herbicida tiene potencial de una larga persistencia en el suelo.

Keywords

AminocyclopyrachlorDissipationinvasive speciessoil residual
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 27 , Issue 3 , September 2013 , pp. 552 - 556
Copyright
Copyright © Weed Science Society of America 

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