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The electrical conductivities (ECs) of suspensions containing 25 and 30 g kg-1 solids prepared from the electrodialyzed clay fraction (< 2μm in diameter) of latosol, yellow-brown soil, and black soil, dispersed in various nitrate solutions having concentrations of 1 × 10-4/2 mol L-1, where z is the valence, and in distilled water, were measured at field strengths ranging from 14 kV cm-1 to 210 kV cm-1. On the basis of analyses of the charge density and exchangeable ion composition on the surfaces of soil particles in the suspensions, and of the characters of the EC-field strength curves of the various suspensions, it was inferred that the increment of EC (△EC) and/or relative electrical conductivity (REC) can indicate the bonding strength between cations and soil particles. The bonding strengths of various cations with the soils diminished in the order: K+ > Zn2+ > Mg2+ = Ca2+ > Na+ for latosol, Ca2+ > Zn2+ > Mg2+ = K+ > Na+ for yellow-brown soil, and Zn2+ > Ca2+ > Mg2+ > K+ > Na+ for black soil.
The electrical conductivities (ECs) of suspensions containing 25 and 30 g kg -1 solid prepared from the electrodialyzed clay fraction (<2 μm in diameter) of latosol, yellow-brown soil, and black soil, dispersed in various nitrate solutions having concentrations of 1 × 10-4 / 2 mol L -1, where z is the valence, and in distilled water, were measured at field strengths ranging from 14 kV cm -1 to 210 kV cm -1. On the basis of analyzes of the charge density and exchangeable ion composition on the surfaces of soil particles in the suspensions, and of the characters of the EC-field strength curves of the various suspensions, it was inferred that the increment of EC (ΔEC) and / or relative electrical conductivity (REC The bonding strengths of various cations with the soils diminished in the order: K +> Zn2 +> Mg2 + = Ca2 +> Na + for latosol, Ca2 +> Zn2 +> Mg2 + = K +> Na + for yellow- brown soil, and Zn2 +> Ca2 +> Mg2 +> K +> Na + for black soil.