[Terrapreta] Marketing comment for TP. (was volatile matter andchar)

[Greg and April]

Expanded shale is another option - but like expanded clay you can all to easily run into availability issues, and that can significantly jump the cost up out of reach of many operations that require more than a small amount.

Not saying it isn't feasible, just that locally produced charcoal of the right size would probably be more cost efficient.

Greg H.

  ----- Original Message ----- 
  From: PurNrg at aol.com 
  To: gregandapril at earthlink.net ; terrapreta at bioenergylists.org 
  Sent: Wednesday, December 26, 2007 13:37
  Subject: Re: [Terrapreta] Marketing comment for TP. (was volatile matter andchar)



  I use lots and lots of PermaTill . It's heat expanded shale graded about the size of pea gravel. It's much more pouros, like pumice, and holds water and, I would imagine, also colonies of micro organisms. When you pull plants out of soil and pots amended with permatill you find the roots clutching the pieces of shale. It does not biodegrade so it's a long lasting amendment which really improves drainage. It's expense is it's only drawback. I can see where the charcoal would act the same way but at this point it is harder to find and more expensive.

  Peter :-)> 

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