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    • IJAFR, volume 55, no. 2, 2016
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    • Irish Journal of Agricultural & Food Research
    • IJAFR, volume 55, no. 2, 2016
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    A methodological framework to determine optimum durations for the construction of soil water characteristic curves using centrifugation

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    Author
    Vero, Sara E.
    Healy, Mark G.
    Henry, Tiernan
    Creamer, Rachel E.
    Ibrahim, Tristan G.
    Forrestal, Patrick J.
    Richards, Karl G.
    Fenton, Owen
    Keyword
    centrifuge
    equilibrium
    soil water characteristic curve
    Date
    30/12/2016
    
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    URI
    http://hdl.handle.net/11019/1147
    Citation
    Vero, S., Healy, M., Henry, T., et al. (2016). A methodological framework to determine optimum durations for the construction of soil water characteristic curves using centrifugation. Irish Journal of Agricultural and Food Research, 55(2), pp. 91-99, doi:10.1515/ijafr-2016-0009
    Abstract
    During laboratory assessment of the soil water characteristic curve (SWCC), determining equilibrium at various pressures is challenging. This study establishes a methodological framework to identify appropriate experimental duration at each pressure step for the construction of SWCCs via centrifugation. Three common temporal approaches to equilibrium – 24-, 48- and 72-h – are examined, for a grassland and arable soil. The framework highlights the differences in equilibrium duration between the two soils. For both soils, the 24-h treatment significantly overestimated saturation. For the arable site, no significant difference was observed between the 48- and 72-h treatments. Hence, a 48-h treatment was sufficient to determine ‘effective equilibrium’. For the grassland site, the 48- and 72-h treatments differed significantly. This highlights that a more prolonged duration is necessary for some soils to conclusively determine that effective equilibrium has been reached. This framework can be applied to other soils to determine the optimum centrifuge durations for SWCC construction.
    Funder
    Teagasc Walsh Fellowship Programme
    ae974a485f413a2113503eed53cd6c53
    https://doi.org/10.1515/ijafr-2016-0009
    Scopus Count
    Collections
    Environment, Soils & Land Use
    IJAFR, volume 55, no. 2, 2016
    IJAFR, volume 55, no. 2, 2016

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