[Terrapreta] Agrichar trialled in field at Wollongbar

[Tom Miles]

Duane, Sean, Michael,

 

These are good references. The ash composition of the woods, grasses,
pulping residues, sludge, etc. will carry varying quantities of nutrients to
the degree that they are retained in the char. Through studies like these we
know more now about the volatility of the inorganics (K, S, Cl) during
pyrolysis, gasification and combustion.  

 

I was referring primarily to measuring the volatile matter (VM) that is
apparently available to the organisms which is what Steiner must have been
referring to as the bio oils that are retained in the char. If a char has
10%,  20% or 40% VM is it all available to the organisms or some portion?
How do we measure that? Is the VM that is available soluble in a dilute
acid?  

 

Tom   

 

 

 

From: terrapreta-bounces at bioenergylists.org
[mailto:terrapreta-bounces at bioenergylists.org] On Behalf Of Duane Pendergast
Sent: Tuesday, April 24, 2007 7:04 AM
To: 'Sean K. Barry'; 'terrapreta'; 'Michael Bailes'
Subject: Re: [Terrapreta] Agrichar trialled in field at Wollongbar

 

Sean, Michael

 

This work from Denmark seems relevant under this topic. A site search on the
authors names indicates it has not been discussed here.

 

http://pubs.acs.org/cgi-bin/abstract.cgi/enfuem/2005/19/i04/abs/ef049739a.ht
ml

 

Duane

 

 

-----Original Message-----
From: terrapreta-bounces at bioenergylists.org
[mailto:terrapreta-bounces at bioenergylists.org] On Behalf Of Sean K. Barry
Sent: April 23, 2007 11:50 PM
To: terrapreta; robert.prince at ngia.com.au; Michael Bailes
Subject: Re: [Terrapreta] Agrichar trialled in field at Wollongbar

 

Hi Michael,

 

Interesting article.

 

Tom Miles was asking earlier this evening about other ways to measure
charcoal.  That article had a few reasonably good suggestions I thought ...

"We will also measure the nutrient content of the agrichar, particularly
calcium and magnesium, its cation exchange capacity, pH and changes to
microbial activity and microbial biomass."

I would also suggest a "pH buffer" capacity measurement.  This is something
Richard Haard mentioned the other day as a measure of soil. I think he
suggested including this type of measurement for soil enhanced with
charcoal.  Your highlight in the article, Michael, "... paper mill waste
applied at a rate of 10 tonnes per hectare raised the soil pH by one unit,
making the soil 10 times less acid." points out the value of "buffering"
acidity and/or alkalinity, which charcoal can provide, when added to soils
which swing away from the ideal (is that neutral pH = 7.0?).

This quote -> "Char itself has a high fertiliser value, depending on its
source.", I would like to discuss.  It seems to me, even if charcoal has
some nutrient content when it is made (and it may well have, since charcoal
is made from biomass), that when and if these nutrients become available for
uptake by plants, then they would soon be depleted, perhaps in a few seasons
of plant growth and harvesting.  But, "Terra Preta" soils are centuries old
and had been there (are still there) for many many years (again centuries).
So, any original fertilizer (plant nutrient) content in charcoal, one put
into the soil and having crops grown on it, would have been depleted long
ago.  Therefore, if the "Terra Preta" soils still retain their fertility,
then there must be something about the charcoal in the soil which helps the
soil maintain it's fertility.  There also must be a continual application of
nutrient containing charcoal and/or plants nutrients from another form,
either organic plant materials (composts) or other sources of plant
nutrients (N, P, K, S, Ca, Fe, Mg).

I think I have repeated this list, (N, P, K, S, Ca, Fe, Mg), like 100 times
since I have been making posts to this site.  A "Plant Propagation"
professor I had a few years back told use to remember all the "required"
plant nutrients by a phrase.  It includes the 3 organic elements from air
and water (Carbon, Hydrogen, Oxygen) and the 6 or 7 organic elements
(Nitrogen, Phosphorus, Potassium, Sulfer, Calcium, Iron, Magnesium, Iodine)
found in soils "See (C) HOPKINS CaFe Manager(Mg)".

Regards,

Sean K. Barry
Principal Engineer/Owner
Troposphere Energy, LLC
11170 142nd St. N.
Stillwater, MN 55082
(651) 351-0711 (Home/Fax)
(651) 285-0904 (Cell)
sean.barry at juno.com

----- Original Message ----- 

From: Michael <mailto:michaelangelica at gmail.com>  Bailes 

To: terrapreta <mailto:terrapreta at bioenergylists.org>  ;
robert.prince at ngia.com.au 

Sent: Tuesday, April 24, 2007 12:10 AM

Subject: [Terrapreta] Agrichar trialled in field at Wollongbar

 


This is the first time I have seen anything on agrichar in a Oz agriculture.


Paper mill waste has up to 70% water content. You would not get much free
electricity from in a pyrolysis process  unless you added some wood waste as
well.. 
Paper mill waste is now dumped in landfill were it produces methane, a
greenhouse gas.


The emphasis and underlining in the article is mine.


 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: /pipermail/terrapreta_bioenergylists.org/attachments/20070424/d4c2383b/attachment-0001.html