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Study of the spatial variation of the biodegradation rate of the herbicide bentazone with soil depth using contrasting incubation methods

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Rodríguez Cruz, M. Sonia , Jones, Julie E. and Bending, G. D. (Gary D.). (2008) Study of the spatial variation of the biodegradation rate of the herbicide bentazone with soil depth using contrasting incubation methods. Chemosphere, Vol.73 (No.8). pp. 1211-1215. ISSN 0045-6535

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Abstract

Vertical and horizontal spatial variability in the biodegradation of the herbicide bentazone was compared in sandy-loam soil from an agricultural field using sieved soil and intact soil cores. An initial experiment compared degradation at five depths between 0 and 80 cm using sieved soil. Degradation was shown to follow the first-order kinetics, and time to 50% degradation (DT50), declined progressively with soil depth from 56 d at 0–10 cm to 520 d at 70–80 cm. DT50 was significantly correlated with organic matter, pH and dehydrogenase activity. In a subsequent experiment, degradation rate was compared after 127 d in sieved soil and intact cores from 0 to 10 and 50 to 60 cm depth from 10 locations across a 160 × 90 m portion of the field. Method of incubation significantly affected mean dissipation rate, although there were relatively small differences in the amount of pesticide remaining in intact cores and sieved soil, accounting for between 4.6% and 10.6% of that added. Spatial variability in degradation rate was higher in soil from 0 to 10 cm depth relative to that from 50 and 60 cm depth in both sieved soil and intact core assessments. Patterns of spatial variability measured using cores and sieved soil were similar at 50–60 cm, but not at 0–10 cm depth. This could reflect loss of environmental context following processing of sieved soil. In particular, moisture content, which was controlled in sieved soil, was found to be variable in cores, and was significantly correlated with degradation rate in intact topsoil cores from 0 to 10 cm depth.

Item Type: Journal Article
Subjects: S Agriculture > SB Plant culture
Divisions: Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Library of Congress Subject Headings (LCSH): Herbicides -- Biodegredation, Soils -- Herbicide content
Journal or Publication Title: Chemosphere
Publisher: Pergamon
ISSN: 0045-6535
Official Date: 2 September 2008
Volume: Vol.73
Number: No.8
Page Range: pp. 1211-1215
Identification Number: 10.1016/j.chemosphere.2008.07.044
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Great Britain. Dept. for Environment, Food & Rural Affairs (DEFRA), Spain. Ministerio de Educación y Ciencia (MEC)
Grant number: Project PL0550 (DEFRA)
References:

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URI: http://wrap.warwick.ac.uk/id/eprint/451

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