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- Title
Degradation of 2,4-DB in Argentinean agricultural soils with high humic matter content.
- Authors
Cuadrado, Virginia; Merini, Luciano J.; Flocco, Cecilia G.; Giulietti, Ana M.
- Abstract
The dissipation of 4-(2,4-dichlorophenoxy) butyric acid (2,4-DB) in high-humic-matter-containing soils from agricultural fields of the Argentinean Humid Pampa region was studied, employing soil microcosms under different experimental conditions. The added herbicide was dissipated almost completely by soils with and without history of herbicide use by day 28. At 500 ppm, both soils showed the same degradation rates; but at 5-ppm concentration, the chronically exposed soil demonstrated a faster degradation of the herbicide. 2,4-DB addition produced increases in herbicide-degrading bacteria of three and 1.5 orders of magnitude in soils with and without history of herbicide use, respectively, in microcosms with 5 ppm. At 500-ppm concentration, the increase in 2,4-DB degraders was five orders of magnitude after 14 days, independent of the history of herbicide use. No differences were observed in either 2,4-DB degradation rates or in degrader bacteria numbers in the presence and absence of alfalfa plants, in spite of some differential characteristics in patterns of 2,4-DB metabolite accumulation. The main factor affecting 2,4-DB degradation rate would be the history of herbicide use, as a consequence of the adaptation of the indigenous microflora to the presence of herbicides in the field.
- Subjects
PAMPAS (Argentina); ARGENTINA; BUTYRIC acid; SOIL testing; HERBICIDES; ALFALFA; METABOLITES
- Publication
Applied Microbiology & Biotechnology, 2008, Vol 77, Issue 6, p1371
- ISSN
0175-7598
- Publication type
Article
- DOI
10.1007/s00253-007-1260-x