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Movement of water and the herbicides atrazine and isoproturon through a large structured clay soil core.

Beck, Angus J. and Lam, Venessa and Henderson, D. Edward and Beven, Keith J. and Harris, Graham L. and Howse, K. Roger and Johnston, A. E. Johnny and Jones, Kevin C. (1995) Movement of water and the herbicides atrazine and isoproturon through a large structured clay soil core. Journal of Contaminant Hydrology, 19 (3). pp. 237-260.

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Abstract

A large (1.1 m × 0.8 m in diameter) core of strongly cracked clay soil was instrumented with eight suction samplers, ten zero-suction samplers and sixteen pressure transducer tensiometers. Results of three rainfall events labelled with potassium bromide, pentafluorobenzoic acid and 2,6-difluorobenzoic acid indicate rapid bypass flow, matrix advection and mixing of water between the soil macropores and the matrix all occurred. Generally, no sharp distinction was observed between crack flow and matrix advection; water flow was best described by a continuum of flow phenomena. Before rainfall application, the herbicides atrazine and isoproturon were applied to the soil surface at rates typically used in the field (2.475 kg active ingredient/ha). Rapid bypass flow in large cracks, by which some of the solutes were transported with limited contact with the soil, was mainly responsible for redistribution of the herbicides and their movement to depth in short time periods. Over the course of the experiments 0.23 pore volumes of rainfall were applied to the core but only 0.02 pore volumes were recovered by gravity drainage. Less than 1% of the herbicides applied was lost in water draining from the soil core.

Item Type: Article
Journal or Publication Title: Journal of Contaminant Hydrology
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22233
Deposited By: ep_ss_importer
Deposited On: 10 Feb 2009 16:18
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 15:58
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22233

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