[Terrapreta] Some 2006 quotes from Johannes Lehmann

[danny day]

Johannes is right.

We know volatile containing char is a food source for microbes
particularly when DOM (dissolved organic matter) is not available.
Research has confirmed that char is only recalcitrant (not impervious)
material to microbial action.  This is why biomass carbon addition is
required with bio-char use.  Compost, a cover crop or leaving some
biomass behind for production of DOM (no-till) contributes to
retaining carbon levels from biochar.  Once the added char has been
incorporated into aggregate formation, its stability increases.

Increasing microbial population via glucose addition without
maintaining typical levels of DOM present for that population level is
an artificial environment which reduces levels of any carbon source,
even the most recalcitrant.

Danny Day

On 5/12/07, Michael Bailes <michaelangelica at gmail.com> wrote:
> > field and incubation studies testing the stability of freshly produced
> bio-char from vegetation burning did not fully corroborate the notion that
> bio-char is very stable in soils.
>
> > priming through co-metabolism of added glucose has been observed to
> increase mineralization of bio-char
>
> Some 2006 quotes from Johannes Lehmann
> http://crops.confex.com/crops/wc2006/techprogram/P16146.HTM
>
> --
>  Michael Bailes.
>
>
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>


-- 
Danny Day
President
EPRIDA
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