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Estimating the Soil Water Dependence of the Electrical Conductivity Soil Solution/Electrical Conductivity Bulk Soil Ratio¹

ABSTRACT

A procedure is developed to calculate the ratio between electrical conductivity (EC) solution (EC_w) and EC of bulk soil (EC_a) as a function of soil water content (). This ratio, (F), changing nonlinearly with , is used to calculate soil solution salinity from measurements of bulk soil electrical conductivity. Obtaining F- 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- relationship by superimposing the complete suction-water retention relationship on two F- measurements at the same values. The experimentally determined F- curve overlaps the theoretically calculated F- relationship at high soil water contents and the empirically obtained F- relationship at low soil water content. Examples are given for several soil types.

¹ Contribution no. 245-E, 1980 series, from the Agricultural Research Organization, The Volcani Center, Bet Dagan, Israel.

² Soil Chemist, Division of Soil Physics.

Received for publication January 12, 1981. Accepted for publication March 15, 1982.

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