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Estimating the Soil Water Dependence of the Electrical Conductivity Soil Solution/Electrical Conductivity Bulk Soil Ratio
Author(s) -
Nadler Arie
Publication year - 1982
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1982.03615995004600040011x
Subject(s) - water content , electrical resistivity and conductivity , soil science , water retention curve , soil salinity , conductivity , soil water , pedotransfer function , suction , environmental science , hydraulic conductivity , materials science , chemistry , thermodynamics , geotechnical engineering , geology , physics , quantum mechanics
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 (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.