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Percolation in macropores and performance of large time-domain reflectometry sensors

Author

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  • F. Doležal

    (Department of Water Resources, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • S. Matula

    (Department of Water Resources, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • J.M. Moreira Barradas

    (Department of Water Resources, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

Abstract

The large-diameter time-domain reflectometry soil water sensors placed horizontally in a structured loamy soil are very sensitive to rapid preferential percolation events. Their readings on these occasions rise considerably, often becoming higher than the native soil's porosity. The effect is caused by gaps between the native soil and the sensors. The geometry of the gaps, even if filled with soil slurry at installation, is not exactly reproducible, which leads to sensor-to-sensor variability of readings. Field calibration in percolation-free periods lead to non-unique trajectories rather than monotonous calibration curves, which can be commented in terms of soil heterogeneity and the dual porosity theory. Data of two typical percolation events are presented. Sensors of this type can be used for detection of preferential flux.

Suggested Citation

  • F. Doležal & S. Matula & J.M. Moreira Barradas, 2012. "Percolation in macropores and performance of large time-domain reflectometry sensors," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(11), pages 503-507.
    • Handle: RePEc:caa:jnlpse:v:58:y:2012:i:11:id:6372-pse
    DOI: 10.17221/6372-PSE
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    References listed on IDEAS

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    1. J. Černý & J. Balík & M. Kulhánek & F. Vašák & L. Peklová & O. Sedlář, 2012. "The effect of mineral N fertiliser and sewage sludge on yield and nitrogen efficiency of silage maize," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 58(2), pages 76-83.
    2. V. Nedvěd & J. Balík & J. Černý & M. Kulhánek & M. Balíková, 2008. "The changes of soil nitrogen and carbon contents in a long-term field experiment under different systems of nitrogen fertilization," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 54(11), pages 463-470.
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    Cited by:

    1. S. Matula & M. Miháliková & J. Lufinková & K. Báťková, 2015. "The role of the initial soil water content in the determination of unsaturated soil hydraulic conductivity using a tension infiltrometer," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 61(11), pages 515-521.

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