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    Effects of over-winter green cover on groundwater nitrate and dissolved organic carbon concentrations beneath tillage land

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    Author
    Premrov, Alina
    Coxon, Catherine E.
    Hackett, Richard
    Kirwan, Laura
    Richards, Karl G.
    Keyword
    Groundwater
    Nitrate
    Dissolved organic carbon
    Over-winter green cover
    Tillage
    Date
    13/09/2012
    
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    URI
    http://hdl.handle.net/11019/184
    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
    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.
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1016/j.scitotenv.2012.08.043
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    Crop Science
    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use
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