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Comparison of the Interactions of Aminopyralid vs. Clopyralid with Soil

Published online by Cambridge University Press:  20 January 2017

Bekir Bukun ,
Dale L. Shaner ,
Scott J. Nissen ,
Philip Westra  and
Galen Brunk
Bekir Bukun
Affiliation:
Department of Plant Protection, Harran University, Sanliurfa, Turkey
Dale L. Shaner*
Affiliation:
USDA-ARS Water Management Research Unit, Fort Collins, CO 80526
Scott J. Nissen
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Philip Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Galen Brunk
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
*
Corresponding author's E-mail: dale.shaner@ars.usda.gov
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Abstract

Laboratory studies were conducted to compare the soil adsorption of aminopyralid and clopyralid with the use of batch-slurry and centrifugation assays. The calculated soil binding constants for both herbicides varied between the two techniques, but the centrifugation assay had a lower coefficient of variation compared to the batch-slurry assay. These results indicate that a centrifugation assay is a more accurate procedure for measuring the interaction of aminopyralid and clopyralid with soils. Aminopyralid adsorbed more tightly than clopyralid to six of the eight soils tested. Adsorption Kd values ranged from 0.083 to 0.364 for clopyralid and 0.106 to 0.697 for aminopyralid. Pearson correlation analysis indicated that binding of both herbicides was highly correlated to soil organic matter and texture but not to soil pH. On average, soil thin-layer chromatography indicated that aminopyralid was less mobile (Rf = 0.82) than clopyralid (Rf = 0.91), although both were mobile. These results suggest that aminopyralid will have a lower leaching potential than clopyralid. Lower potential aminopyralid soil leaching, coupled with low use rates, suggests it may be the herbicide of choice in areas where potential for leaching could be a concern.

Keywords

AminopyralidclopyralidSoil adsorptionKdRf
Type
Soil, Air, and Water
Information
Weed Science , Volume 58 , Issue 4 , December 2010 , pp. 473 - 477
Copyright
Copyright © Weed Science Society of America 

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