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Adsorption and relative mobility of flumetsulam

Published online by Cambridge University Press:  12 June 2017

David R. Shaw  and
Glen P. Murphy
Glen P. Murphy
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762
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Abstract

Laboratory studies were conducted to evaluate flumetsulam adsorption and mobility in seven Mississippi soils of different organic matter content, pH, and texture. Adsorption isotherms were determined for all soils using a 1:1 (soil: water) technique. In six of seven soils, Freundlich n constants were close to unity, suggesting a partitioning-like adsorption mechanism for flumetsulam. Mobility was examined using packed soil columns. 14C-flumetsulam recoveries in leachate ranged from 1 to 70% and were influenced by both organic matter content and soil pH. However, the effects of organic matter content and soil pH were not independent. Consequently, clear relationships between flumetsulam mobility and either organic matter content or soil pH were not established across all soils. However, among soils of similar pH (7.5 ± 0.3), mobility decreased linearly (R 2 = 0.75) as organic matter content increased from 0.7 to 3.6%. Across soils with similar organic matter content (3.9 ± 0.3%), mobility increased linearly (R 2 = 0.98) as soil pH increased from 5.3 to 7.2. Net adsorption constants (K d ) provided a more accurate assessment of flumetsulam mobility across all soils than K oc .

Keywords

Flumetsulam, N-(2,6-difluorophenyl)-5-methyl[1,2,4]triazolo[1,5a] pyrimidine-2-sulfonamideLeachingsoil organic mattersoil pHsoil texture
Type
Soil, Air, and Water
Information
Weed Science , Volume 45 , Issue 4 , August 1997 , pp. 573 - 578
Copyright
Copyright © 1997 by the Weed Science Society of America 

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References

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