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Idesia (Arica)

On-line version ISSN 0718-3429

Abstract

MERCADO FERNANDEZ, Teobaldis; ORTEGA ESCOBAR, Manuel; ARENAS TAWIL, Abrahan  and  COMBATT CABALLERO, Enrique. Salt dynamics in the irrigation district of La Doctrina, Colombia. Idesia [online]. 2011, vol.29, n.1, pp.83-90. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292011000100011.

The present research was conducted in the irrigation and drainage district of La Doctrina and its adjacent zones with an area of 4160 hectares, located in the Department of Córdoba in the north of Colombia, which has an average precipitation of 1000 mm, a temperature of 28 °C and relative humidity of 80%. The dynamics of salt in the soil and the superficial aquifers were evaluated through the measurement of depths and elevations of the water table during one year (June 2003 to June 2004) and the determination of the salinity of soils and aquifers in a chain of 27 observation wells on three sampling dates (September 2003, November 2003 and March 2004). Zones were found with a water table depth of less than 0.5 m and with salinity greater than 2 dS/m, with temporal and spatial variation of salts detected from the planes of salinity analyzed, which represent high salinity irrigation for those soils. It was observed that the saline zones coincide with the zones of discharge of the phreatic flow. The principal soluble salts present were sodium chloride (NaCl) and magnesium chloride (MgCl2), which are of high solubility and toxicity for the plants.

Keywords : Isobatas; isohypsas; salinity maps; sodium chloride; magnesium chloride.

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