[Terrapreta] Pure Organics Vs. Biological Agriculture

[ch braun]

Hello,

Which papers/authors deal more particularly with the problem of determining
with precision the time duration of carbon sequestration in TP soils ?

Thanks,
Christelle

On 9/19/07, Sean K. Barry <sean.barry at juno.com> wrote:
>
>  Hi David, Kevin,
>
> David makes a good point here, Kevin.  The data is not non-existent.  It
> does exist.  Some of it is very expensive.  Johannes Lehmann's book "Dark
> Earth" costs $229.  Some of it is a very tough read, too.  I have read some
> from all of the authors you mentioned, David.  I bought "Dark Earth" from
> Springer Books and I have read only some parts of it.  I am a believer in
> all the benefits (1), 2), and 3)) of Terra Preta.
>
> But, I will tell you that the economics of this are right now very
> difficult.  I CANNOT make charcoal from biomass and sell it for only
> $200/ton.  I would lose money doing that.  I CANNOT make lots of tons of
> charcoal, either.  The only way that I can do it cleanly is by "flaring" the
> producer gas.  I am working on ways to use the waste heat and the fuel
> gases, but even when I do, it will still be hard to make a profit, even at
> $200/ton.  And, $200/ton is way more than farmers are willing to pay to put
> 5-20 tons per acre onto their land.  They will not do it unless they see a
> darn near immediate equivalent monetary benefit in the productivity of their
> field.
> They will not pay for the opportunity to "save the world".
>
> Some would claim that "I am tilting at a windmill" on this.  But, I am an
> optimist.  I am trying very hard to find ways to bring value (in all the
> forms 1), 2), and 3)) to what I am trying to do.  I will continue to work of
> making charcoal from biomass a more valuable commodity (or service) and I
> will continue to find ways to make charcoal from biomass in the most
> efficient way possible.
>
> Regards,
>
> SKB
>
>
>
> ----- Original Message -----
> *From:* David Yarrow <dyarrow at nycap.rr.com>
> *To:* terrapreta at bioenergylists.org
> *Sent:* Tuesday, September 18, 2007 8:59 PM
> *Subject:* Re: [Terrapreta] Pure Organics Vs. Biological Agriculture
>
> try reading johannes lehmann, christoph steiner, bruno glaser, makato
> ogawa,
> wim sombroek, william woods...  lots of data already exists documenting
> the
> history and productivity of terra preta.
>
> ----- Original Message -----
> From: "Kevin Chisholm" <kchisholm at ca.inter.net>
>
> > Would you have any test results you could refer us to, to support these
> > statements?
>
>
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