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  • From: Rael Bassan <rael@ripco.com>
  • To: permaculture@lists.ibiblio.org
  • Subject: [permaculture] Harvesting of prairie biomass for energy?
  • Date: Thu, 25 Jan 2007 16:28:19 -0600

In a recent [Permaculture Forum (Upper Midwest)] post there was some concern about the proposed harvesting of prairie biomass for energy, suggested by the Minnesota studies of David Tillman's group. According to their analysis, using a prairie plant mixture of up to 14 species "comes out 6 to 16 times better than corn grain ethanol or biodeisel [sic] ." www.vnps.org/chapters/princewilliam/wildnewsjanfeb07.pdf

Impressed by the potential of the technology, I'm repeating the posts below for comment....Rael

[My response]
With minor modification it could become a tool of permaculture. If the harvesting equipment distributed the ashes from last years burning, it would be similar to the Native American fire management that shaped the prairies. Areas were burned as often as alternative years.

Also a portion of the biomass harvested could be pyrolyzed to charcoal, and used in Terra Preta / biochar technology...
>>
http://gristmill.grist.org/story/2007/1/13/154846/114#comment34
Time to Master the Carbon Cycle [Greal Links]
16 Jan 2007 Erich J. Knight, Shenandoah Gardens
..." a strategy combining biochar with biofuels could ultimately offset 9.5 billion tons of carbon per year-an amount equal to the total current fossil fuel emissions! "
...I feel Terra Preta soil technology is the greatest of Ironies.
That is: an invention of pre-Columbian American culture, destroyed by western disease, may well be the savior of industrial western society.

><> Bio-char, Soil Biogeochemistry, Johannes Lehmann
http://www.css.cornell.edu/faculty/lehmann/biochar/Biochar_home.htm
bio-char ... is much more effective in retaining most nutrients and keeping them available to plants than other organic matter for example common leaf litter, compost or manures. Interestingly, this is also true for phosphorus which is not at all retained by 'normal' soil organic matter.

Rael

Rael Bassan
Coordinator
Chicagoland Urban Permaculture (CUP)
http://sustaincup.blogspot.com/

At 08:00 PM 1/24/2007 -0600, dhalsey@integra.net wrote:
Re: [Permaculture Forum] WCCO TV Appearance
I have bad feeling about prairie grasses.
Nothing will be returned to the soil and it will be the same old story.
Such fascination with new sources for old habits.
Like in Geoff's video except we are the maggots.
As you might tell, I am very skeptical of all this.
It is not PERMACULTURE. I do not believe you can renew what you burn.
The Sun is free, clean and limitless. The wind is free, ample and clean.
Save the carbon fuels for critical needs and transitioning.
Must we burn everything we find? This just feels wrong?

Dan

http://wcco.com/energy/local_story_022224523.html

>From the article, "Tilman's research now shows that
the opposite will be true when it comes to growing
crops for fuel. He and his research team discovered
that land planted with a highly diverse mix of prairie
grasses and plants will actually produce more than
twice the bioenergy of the same land planted with any
single species, including Corn.

"We were getting as much and in fact, in some
conversion processes, more energy per acre on marginal
land than we get with current corn production," Tilman
explained.

Perhaps even more promising are the findings
concerning greenhouse gasses. Native prairie grasses
and plants appear to drastically reduce greenhouse
gasses, findings recently published in the journal
"Science."

By capturing airborne carbon dioxide and returning it
to the soil, prairie grass biofuels are essentially
carbon negative."

He goes onto say, even if you used all of the corn
currently in production the ethanol would be less than
15% of what we consume ....

Food for thought......
--- Paula Westmoreland <paula@ecologicalgardens.com>
wrote:

> FYI - thought you might be interested - Paula





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