Aug 26, 2014· (Black Carbon Increases CEC in Soils, B Liang et al, Soil Sci. Soc. Am. J. 70:1719–1730, 2006) — Ideal Soil 2nd edition, by Michael Astera. By comparison, poor, sandy soil with little to no organic matter would have a Cation Exchange Capacity (the ability to hold positively charged soil nutrients) in the range 1-4.