Influence of the laboratory incubation method on chlorotoluron and terbutryn degradation in soil
Degradation of the herbicides chlorotoluron and terbutryn was assayed using three different incubation systems columns of undisturbed soil, columns packed with sieved soil, and flasks. Two different soils were employed, a sandy loam (A) and a loam soil (B), and different temperature (4-32 °C) and moisture content (7-13%) conditions were assayed. Dissipation of both herbicides in soil A for treatment T2 (25 °C and 10% of moisture content) was significantly different in the three different incubation systems assayed. In the case of soil B, with lower organic matter content, the obtained half-lives for treatment T2 were statistically indistinguishable in all the incubation systems, with the exception of the flask incubation of terbutryn. Incubation in packed cores generally yielded longer half-lives than flask incubations in all the other treatments for both soils and both compounds. Differences among incubation systems were greater with terbutryn than with chlorotoluron, which has a lower sorption coefficient.
| Main Authors: | , , |
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| Format: | journal article biblioteca |
| Language: | eng |
| Published: |
1997
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| Online Access: | http://hdl.handle.net/20.500.12792/2358 |
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