C.M. Heppell
A packed lysimeter experiment to investigate the effect of surface sealing on hydrology and pesticide loss from the reconstructed profile of a clay soil: 2. Pesticide loss
Heppell, C.M.; Chapman, A.S.; Bidwell, V.J.; Kilfeather, A.A.
Authors
A.S. Chapman
V.J. Bidwell
A.A. Kilfeather
Abstract
A laboratory experiment was designed to assess the impact of surface seal development on herbicide loss from a clay soil. The influence of surface sealing on herbicide loss through vertical macropores and lateral throughflow pathways was of particular interest. Losses of the phenylurea herbicide, isoproturon, increased from 0.025% to 0.5% of the total applied under sealed compared with unsealed conditions, as a result of two different mechanisms. First, an increased flow rate through the A horizon under the wetter, sealed conditions resulted in earlier initiation of, and hence a greater volume of, throughflow containing isoproturon in the lysimeters. Second, increased concentrations of isoproturon in macropore and throughflow under the sealed treatments were attributed to the physical and chemical characteristics of the surface seal. Localized reductions in infiltration capacity, changes in soil composition, and decrease in diffusion depth of herbicide within the surface seal are presented as possible mechanisms by which herbicide losses from the sealed soil lysimeters were enhanced.
Citation
Heppell, C., Chapman, A., Bidwell, V., & Kilfeather, A. (2004). A packed lysimeter experiment to investigate the effect of surface sealing on hydrology and pesticide loss from the reconstructed profile of a clay soil: 2. Pesticide loss. Soil Use and Management, 20(4), 384-393. https://doi.org/10.1111/j.1475-2743.2004.tb00387.x
Journal Article Type | Article |
---|---|
Publication Date | Dec 1, 2004 |
Deposit Date | Sep 16, 2009 |
Journal | Soil Use and Management |
Print ISSN | 0266-0032 |
Electronic ISSN | 1475-2743 |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 20 |
Issue | 4 |
Pages | 384-393 |
DOI | https://doi.org/10.1111/j.1475-2743.2004.tb00387.x |
Keywords | Lysimeter, Macropore, Throughflow, Subsurface lateral flow, Herbicide, Surface seal, Surface crust. |
Publisher URL | http://www.ingentaconnect.com/content/bpl/sum/2004/00000020/00000004/art00003 |
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