Estimating the Soil Water Dependence of the Electrical Conductivity Soil Solution/Electrical Conductivity Bulk Soil Ratio1
- Arie Nadler2
A procedure is developed to calculate the ratio between electrical conductivity (EC) solution (ECw) and EC of bulk soil (ECa) as a function of soil water content (θ). This ratio, (F), changing nonlinearly with θ, is used to calculate soil solution salinity from measurements of bulk soil electrical conductivity. Obtaining F-θ relationships for intermediate and low soil moisture levels by an accurate theoretical model is impractical due to the complicated interdependence of several solid- and liquid-phase parameters. Therefore an empirical approach was adopted to obtain the complete F-θ relationship by superimposing the complete suction-water retention relationship on two F-θ measurements at the same θ values. The experimentally determined F-θ curve overlaps the theoretically calculated F-θ relationship at high soil water contents and the empirically obtained F-θ relationship at low soil water content. Examples are given for several soil types.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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