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Re: Does bentonite make a good substrate additive for cation exchange? (nt)
> From: Zxcvbob at aol_com
> Does bentonite make a good substrate additive for cation exchange? (nt)
Just about any temperate climate clay has a much higher CEC than laterite.
I think bentonite may be a smectite clay like montmorillonite. Laterite
is mainly or exclusively composed of hydrous oxide type clay minerals.
Here are some numbers from a soil science book (Brady's Nature and Properties
Colloid Max CEC by weight Max CEC by volume
Humus (organic) 300 75
Vermiculite 120 150
Smectite 90 113
Fine-grained micas 25 31
Kaolinite 5 6
Hydrous oxides 3 4