Cation exchange capacity (CEC)
From PLANTFACTS.OSU.EDU
1. The sum total of exchangeable cations that a soil can absorb.

Absorbable cations
Source: http://www.microsoil.com/SoilpH.htm
1. The sum total of exchangeable cations that a soil can absorb.

Absorbable cations
Source: http://www.microsoil.com/SoilpH.htm