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Characterization of Alachlor and Atrazine Desorption from Soils

Published online by Cambridge University Press:  12 June 2017

Sharon A. Clay  and
William C. Koskinen
Sharon A. Clay
Affiliation:
Soil and Water Research Unit, USDA-Agricultural Research Service, 439 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108
William C. Koskinen
Affiliation:
Soil and Water Research Unit, USDA-Agricultural Research Service, 439 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108
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Abstract

Herbicide desorption isotherms may be affected by the amount of nondesorbable herbicide present in soil. Nondesorbable alachlor (as determined after methanol extraction) generally increased on a Waukegan silt loam (Typic Hapludolls) and a Ves clay loam (Udic Haplustolls) during five 0.01 M CaCl2 desorptions. Atrazine was totally extracted with methanol from the Waukegan soil after one desorption using 0.01 M CaCl2. However, after five desorptions with 0.01 M CaCl2 an average of 5.5 and 15.5% of the total recovered atrazine from two atrazine application rates was methanol nondesorbable from the Waukegan and Ves soils, respectively. Freundlich desorption isotherms adjusted for nondesorbable herbicide accounted for as much as 71 % of the difference between adsorption and desorption isotherms. Only a portion of the hysteresis observed can be attributable to nondesorbable herbicide.

Keywords

Alachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamideatrazine, 6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamineHysteresisFreundlich isothermsadsorptionnondesorbable herbicidebound herbicide
Type
Soil, Air, and Water
Information
Weed Science , Volume 38 , Issue 1 , January 1990 , pp. 74 - 80
Copyright
Copyright © 1990 by the Weed Science Society of America 

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References

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