Biodegradation-transport interactions of pulse applied 2,4-D in repacked soil column microcosms

Shaw, Liz J. and Burns, Richard G. (1998) Biodegradation-transport interactions of pulse applied 2,4-D in repacked soil column microcosms. Journal of Environmental Quality, 27 (6). pp. 1472-1478. ISSN 0047-2425. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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To predict leaching to groundwater, reliable data are needed regarding the in situ biodegradation of pesticides. Repacked soil column microcosms were used to examine the transport and biodegradation of 2,4-dichlorophenoxyacetic acid (2.4-D) in a noncontaminated soil profile, For columns spiked with M-D (2.4 mg) and leached with 1.81 cm d(-1), maximum leachate concentrations were 4.65 mg L-1. After 30 d, 41.0% was recovered in the leachate and <0.04% by soil extraction, 2.4-D biodegradation and the distribution and abundance of degrading microorganisms was determined by the leaching rate and the number of herbicide applications. For example, biodegradation of repeat 2,4-D applications was enhanced: the first and second applications were degraded by 44.5 and 72.6%, respectively. This corresponded to a > 10(3)-fold increase in numbers of 2,4-D-degraders at all deaths following the first application. A twofold reduction in the irrigation rate also increased biodegradation front 44.5 to 77.2%. Columns of different lengths were used to quantify in situ biodegradation for discrete soil profile sections (10 cm). Subsoil biodegradation was higher (43.0%) in columns than it was in batch ex situ experiments (22.3%) after 30 d, The detection of 2,4-D-degraders in column subsoil and leachate suggests that downward transport of degrading microorganisms through the soil profile occurs, and could account for discrepancy between batch and column data.

Item Type: Article
Subjects: Q Science > QH Natural history > QH75 Conservation (Biology)
G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions: Faculties > Science Technology and Medical Studies > School of Biosciences
Depositing User: Tara Puri
Date Deposited: 03 Jul 2009 10:20
Last Modified: 13 May 2014 13:21
Resource URI: (The current URI for this page, for reference purposes)
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