Effects of Evaporation and Different Flow Regimes on Solute Distribution in Soil

Authors: Öztürk, H.; Özkan, İ.

Source: Transport in Porous Media, Volume 56, Number 3, September 2004 , pp. 245-255(11)

Publisher: Springer

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Abstract:

Water evaporation and solute transport processes were studied in large soil columns filled with a sandy clay loam (SCL) and a clay loam (CL) soils. To create different water flow velocity through the soil column, the 3 cm (Treatment I) and 6 cm (Treatment II) depths of water were ponded at the soil surface during leaching. After leaching, soils were left for evaporation for 10 days. Some salinity parameters were monitored during three leaching and evaporation periods. To achieve the same degree of leaching more water was needed in Treatment II than in Treatment I for both soils. The electrical conductivity (EC) at the soil surface after evaporation increased, to 41–46% of the pre-drying level for the SCL and 28–31% for the CL. Although very low concentrations of Cl⁻ were detected at the soil surface after the first leaching in both soils, high increase was monitored after the evaporation period, due to the high mobility of this anion. The fluctuation of exchangeable sodium percentage (ESP) during the leaching and evaporation periods was attributed to the different transportation rates of Na⁺, Ca²⁺ and Mg²⁺. The boron leaching in Treatment I was more effective than that in Treatment II for both soils.

Keywords: solute transport; leaching; evaporation; upward and downward ion transport; boron leaching

Document Type: Research article

DOI: http://dx.doi.org/10.1023/B:TIPM.0000026088.13958.43

Affiliations: 1: Department of Soil Science, Faculty of Agriculture, Ankara University, 06110, Diskapi, Ankara, Turkey,

Publication date: 2004-09-01