Sorption of Metribuzin and Metolachlor in Alaskan Subarctic Agricultural Soils
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 isoth...
| Published in: | Weed Science |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Cambridge University Press (CUP)
1992
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1017/s004317450005712x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S004317450005712X |
| Summary: | 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 (K f ) were affected by both soil type and equilibration temperature, with soil type accounting for greater than 80% of the variation in K f . Surface soil mean K f 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 K f . Isotherm slopes for desorption were less than adsorption, indicating hysteresis. Regressions between desorption K f and maximum herbicide adsorbed prior to desorption were highly significant with coefficients of determination (r 2 ) between 0.50 and 0.99. |
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