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    N leaching to groundwater from dairy production involving grazing over the winter on a clay-loam soil

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    Author
    Necpalova, Magdalena
    Fenton, Owen
    Casey, Imelda A.
    Humphreys, James
    Keyword
    extended grazing
    permanent grassland
    dairy production
    N leaching
    shallow groundwater
    time lag
    DNRA
    Date
    15/08/2012
    
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    URI
    http://hdl.handle.net/11019/82
    Citation
    M. Necpalova, O. Fenton, I. Casey, J. Humphreys. N leaching to groundwater from dairy production involving grazing over the winter on a clay-loam soil, Science of The Total Environment, 432, (2012), 159-172. DOI:10.1016/j.scitotenv.2012.05.091.
    Abstract
    This study investigated concentrations of various N species in shallow groundwater (< 2.2 m below ground level) and N losses from dairy production involving grazing over the winter period on a clay loam soil with a high natural attenuation capacity in southern Ireland (52˚51’N, 08˚21’W) over a two year period. A dense network of shallow groundwater piezometers was installed to determine groundwater flow direction and N spatial and temporal variation. Estimated vertical travel times through the unsaturated zone (<0.5 yr, time lag) allowed the correlation of management with groundwater N within a short space of time. There was a two way interaction of the system and sampling date (P < 0.05) on concentrations of DON, oxidised N and NO3--N. In contrast, concentrations of NH4+-N and NO2--N were unaffected by the dairy system. Grazing over the winter had no effect on N losses to groundwater. Mean concentrations of DON, NH4+-N, NO2--N and NO3--N were 2.16, 0.35, 0.01 and 0.37 mg L-1 respectively. Soil attenuation processes such as denitrification and DNRA resulted in increased NH4+-N levels. For this reason, DON and NH4+-N represented the highest proportion of N losses from the site. Some of the spatial and temporal variation of N concentrations was explained by correlations with selected chemical and hydro-topographical parameters (NO3--N/Cl- ratio, distance of the sampling point from the closest receptor, watertable depth, depth of sampling piezometer, DOC concentration). A high explanatory power of NO3--N/Cl- ratio and the distance of the sampling point from the closest receptor indicated the influence of point sources and groundwater-surface water interactions.
    Funder
    Department of Agriculture, Food and the Marine, Ireland
    Grant Number
    RSF07-511
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1016/j.scitotenv.2012.05.091
    Scopus Count
    Collections
    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Livestock Systems

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