Abstract
A procedure for examining water and solute transport in large undisturbed soil cores is described and tested. The procedure involves three main steps: (1) collecting soil cores using a “pushing method”, (2) attaching a tension drainage system once soil cores are transported to the laboratory, and (3) inserting tensiometers and thetaprobes for continuous monitoring of soil water tension and soil water content before, during and after, water and solute application. This procedure allows accurate recording of the soil hydraulic properties over the entire experiment, and provides valuable information for developing and running mathematical simulation models. Application of the outlined procedure to solute leaching is demonstrated for a well-structured Oxisol. Results from the laboratory leaching study are compared with theoretical predictions using a simple analytical model for weakly-sorbed ions. Contrasting behaviour between the model predictions and the experimental data is attributed to ion adsorption by the soil colloids.
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