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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/184

Title: Effects of over-winter green cover on groundwater nitrate and dissolved organic carbon concentrations beneath tillage land
Authors: Premrov, Alina
Coxon, Catherine E.
Hackett, Richard
Kirwan, Laura
Richards, Karl G.
Keywords: Groundwater
Nitrate
Dissolved organic carbon
Over-winter green cover
Tillage
Issue Date: 13-Sep-2012
Publisher: Elsevier
Citation: Alina Premrov, Catherine E. Coxon, Richard Hackett, Laura Kirwan, Karl G. Richards, Effects of over-winter green cover on groundwater nitrate and dissolved organic carbon concentrations beneath tillage land, Science of The Total Environment, Volume 438, 1 November 2012, Pages 144-153, DOI: 10.1016/j.scitotenv.2012.08.043
Series/Report no.: Science of the Total Environment;vol. 438
Abstract: Application of over-winter green cover (e.g. cover crops) as a measure for reducing nitrate losses from tillage land has been frequently investigated, especially in the unsaturated zone. Monitoring of groundwater is less common in these studies. Studies on groundwater responses to different land treatments can be challenging because they can be influenced by various conditions, such as recharge, seasonal variations, and aquifer properties, often occurring at different time scales than surface water processes. The aim of this study was to evaluate groundwater nitrate (NO3−single bondN) and dissolved organic carbon (DOC) concentration responses to different over-winter green covers: mustard, natural regeneration and no cover. A field experiment was designed and run for three years on tillage land underlain by a vulnerable sand and gravel aquifer in the south-east of Ireland. Results showed that over-winter green cover growth on tillage land can be an effective measure to reduce groundwater NO3−single bondN concentrations. A significant decrease in groundwater NO3−single bondN concentrations was observed under the mustard cover compared to no cover. All treatments, including no cover, showed a decline in groundwater NO3−single bondN concentrations over time. A significant increase in groundwater DOC was also observed under the mustard cover. Although the overall groundwater DOC concentrations were low, the increased DOC occurrence in groundwater should be accounted for in carbon balances and could potentially enhance groundwater denitrification in cases where aquifer conditions may favour it.
Description: peer-reviewed
This is the author’s version of a work that was accepted for publication in Science of the Total Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Science of The Total Environment, Volume 438, 1 November 2012, Pages 144–153. DOI:10.1016/j.scitotenv.2012.08.043
URI: http://hdl.handle.net/11019/184
http://www.sciencedirect.com/science/article/pii/S0048969712011278
http://dx.doi.org/10.1016/j.scitotenv.2012.08.043
ISSN: 0048-9697
Appears in Collections:Crop Science
Environment, Soils & Land Use

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