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

Content Provider	Springer Nature Link
Author	Tedeschi, A. Menenti, M.
Copyright Year	2002
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.
Starting Page	89
Ending Page	103
Page Count	15
File Format	PDF
ISSN	09204741
Journal	Water Resources Management
Volume Number	16
Issue Number	2
e-ISSN	15731650
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Institution	European Water Resources Association (EWRA)
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Meteorology/Climatology Geotechnical Engineering Civil Engineering Environment
Content Type	Text
Resource Type	Article
Subject	Water Science and Technology Civil and Structural Engineering

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