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    The effect of renovation of long-term temperate grassland on N2O emissions and N leaching from contrasting soils

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    Author
    Krol, D. J.
    Jones, M. B.
    Williams, M.
    Richards, Karl G.
    Bourdin, F.
    Lanigan, Gary
    Keyword
    Nitrous oxide
    Leaching
    Grassland renovation
    Conventional tillage
    Minimum tillage
    Lysimeter
    Date
    2016-04-19
    
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    URI
    http://hdl.handle.net/11019/1030; http://dx.doi.org/10.1016/j.scitotenv.2016.04.052
    Citation
    D.J. Krol, M.B. Jones, M. Williams, K.G. Richards, F. Bourdin, G.J. Lanigan, The effect of renovation of long-term temperate grassland on N2O emissions and N leaching from contrasting soils, Science of The Total Environment, Volumes 560–561, 1 August 2016, Pages 233-240, DOI:10.1016/j.scitotenv.2016.04.052
    Abstract
    Renovation of long-term grassland is associated with a peak in soil organic N mineralisation which, coupled with diminished plant N uptake can lead to large gaseous and leaching N losses. This study reports on the effect of ploughing and subsequent N fertilisation on the N2O emissions and DON/NO3− leaching, and evaluates the impact of ploughing technique on the magnitude and profile of N losses. This study was carried out on isolated grassland lysimeters of three Irish soils representing contrasting drainage properties (well-drained Clonakilty, moderately-drained Elton and poorly-drained Rathangan). Lysimeters were manually ploughed simulating conventional (CT) and minimum tillage (MT) as two treatments. Renovation of grassland increased N2O flux to a maximum of 0.9 kg N2O–N ha− 1 from poorly-drained soil over four days after treatment. Although there was no difference between CT and MT in the post-ploughing period, the treatment influenced subsequent N2O after fertiliser applications. Fertilisation remained the major driver of N losses therefore reducing fertilisation rate post-planting to account for N mineralised through grassland renovation could reduce the losses in medium to longer term. Leaching was a significant loss pathway, with the cumulative drainage volume and N leached highly influenced by soil type. Overall, the total N losses (N2O + N leached) were lowest from poorly and moderately draining soil and highest for the well draining soil, reflecting the dominance of leaching on total N losses and the paramount importance of soil properties.
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