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Re: Pumice contents

Robert H writes (actually quotes Cornell University):

> Pumice can absorb K, Mg, P, and Ca            
>  from the soil solution and render it available for plant
>  absorption later 

KEWL!! It has a CEC value.  With its relatively large surface/volume ratio,
that could mean lots of nutrient in the substrate, sequestered where it needs
to be.

Bob Dixon