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Indicators of the Seasonal Cycle of Total Dissolved and Adsorbed Salts under Irrigation

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  • A. Tedeschi
  • M. Menenti

Abstract

This article describes the evaluation of indicators computed with a numerical simulation model of soil water and solute flow against field measurements of the amount of adsorbed and dissolved salts. In the Mediterranean environment,characterised by hot, dry summers, a field experiment on irrigation of vegetable crops with saline and tubewell water was carried out between 1988 and 1996 at a site near Naples, Italy. The investigation was carried out on a clay-loam soil classified as Argiustolls. Irrigation treatments were: tubewell water (no addition of NaCl), addition of 1.25, 2.5, 5 and 10 g NaCl L -1 . Three irrigation intervals were applied until 1995: 2, 5 and 10 days. In 1995 all plots were irrigated on pre-selected days of the year, but the amount of water was equal to 100%, respectively 75 and 50% for the three irrigation treatments. Except 1996, all plots received consistently the same irrigation and salinity treatment, although different crops were grown on the same plot during the 8 yr experiment. In 1996, the indicator of soil salinity was used to evaluate the salt accumulation in the soil after a long time of saline irrigation. The indicator applied was the total amount of dissolved and adsorbed salts measured and simulated, in this way observation and model calculations are truly comparable. The aims were to evaluate the accuracy and relevance of salinity indicator computed by means of a numerical deterministic model describing water and solute transport SWAP. Total amount of salts were determined on soil samples, collected through the irrigation season on the treatments 0 and 5 g NaCl L -1 . The samples were taken at three depths. The CEC and soluble salt were measured, beside the initial (prior to saturation in the laboratory) composition of the soil samples. Total dissolved and adsorbed salts were calculated throughout the irrigation season with the model SWAP. Calculated salt concentration was compared with observed soil composition to assess the accuracy of model calculations. Copyright Kluwer Academic Publishers 2002

Suggested Citation

  • A. Tedeschi & M. Menenti, 2002. "Indicators of the Seasonal Cycle of Total Dissolved and Adsorbed Salts under Irrigation," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 16(2), pages 89-103, April.
    • Handle: RePEc:spr:waterr:v:16:y:2002:i:2:p:89-103
    DOI: 10.1023/A:1016151619518
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    References listed on IDEAS

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    1. Smets, S. M. P. & Kuper, M. & Van Dam, J. C. & Feddes, R. A., 1997. "Salinization and crop transpiration of irrigated fields in Pakistan's Punjab," Agricultural Water Management, Elsevier, vol. 35(1-2), pages 43-60, December.
    2. Tedeschi, A. & Menenti, M., 2002. "Simulation studies of long-term saline water use: model validation and evaluation of schedules," Agricultural Water Management, Elsevier, vol. 54(2), pages 123-157, March.
    3. Andreu, L. & Moreno, F. & Jarvis, N. J. & Vachaud, G., 1994. "Application of the model MACRO to water movement and salt leaching in drained and irrigated marsh soils, Marismas, Spain," Agricultural Water Management, Elsevier, vol. 25(1), pages 71-88, February.
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    1. Bastiaanssen, W.G.M. & Allen, R.G. & Droogers, P. & D'Urso, G. & Steduto, P., 2007. "Twenty-five years modeling irrigated and drained soils: State of the art," Agricultural Water Management, Elsevier, vol. 92(3), pages 111-125, September.
    2. Tedeschi, A. & Dell'Aquila, R., 2005. "Effects of irrigation with saline waters, at different concentrations, on soil physical and chemical characteristics," Agricultural Water Management, Elsevier, vol. 77(1-3), pages 308-322, August.

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