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Sorption of Metribuzin and Metolachlor in Alaskan Subarctic Agricultural Soils

Published online by Cambridge University Press:  12 June 2017

Jeff S. Graham  and
Jeffery S. Conn
Jeff S. Graham
Affiliation:
Res. Agron's, USDA-ARS, Subarctic Agric. Res. Unit, 309 O'Neill Bldg., Univ. Alaska, Fairbanks, AK 99775
Jeffery S. Conn
Affiliation:
Res. Agron's, USDA-ARS, Subarctic Agric. Res. Unit, 309 O'Neill Bldg., Univ. Alaska, Fairbanks, AK 99775
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Abstract

Adsorption and desorption of metribuzin and metolachlor were studied for 0- to 15- and 30- to 45-cm soil depths and at 5 and 28 C temperatures for two subarctic Alaskan agricultural soils. Surface soils had five to eight times the organic carbon content of deeper soils and had lower Freundlich isotherm slopes (1/n) for both herbicides. Surface soil Freundlich coefficients (Kf) were affected by both soil type and equilibration temperature, with soil type accounting for greater than 80% of the variation in Kf. Surface soil mean Kf values ranged from 1.5 to 2.4 for metribuzin and 4.4 to 9.2 for metolachlor. For soils from the 30- to 45-cm depth, neither soil type nor temperature affected Kf. Isotherm slopes for desorption were less than adsorption, indicating hysteresis. Regressions between desorption Kf and maximum herbicide adsorbed prior to desorption were highly significant with coefficients of determination (r2) between 0.50 and 0.99.

Keywords

Metribuzin, 4-amino-6-(1,1-dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-onemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamideHysteresissoil organic carbonlow soil temperatures
Type
Soil, Air, and Water
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 155 - 160
Copyright
Copyright © 1992 by the Weed Science Society of America 

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