In article e.nl,
"Alex" wrote:

"Nancy Young" schreef in bericht
...
Hi, all.

I keep hearing good things about biochar as a soil amendment.

Does anyone here have experience using it? I'm thinking of
adding it to my flower gardens and vegetable beds.

nancy

It has as tendency to absorb nutrients and water, so it
is best to first inoculate it with compost or compost tea.

Alex

1491: New Revelations of the Americas Before Columbus by Charles C. Mann

http://www.amazon.com/1491-Revelatio...umbus/dp/14000
32059/ref=sr_1_1?s=books&ie=UTF8&qid=1296839060&sr=1-1

p.345
Terra preta exists in two forms: terra preta itself, a black soil thick
with pottery, and terra mulata, a lighter dark brown soil with much less
pottery. A number of researchers believe that although Indians made
both, they deliberately created only the terra mulata. Terra preta was
the soil created directly around homes by charcoal kitchen fires and
organic refuse of various types.

As a rule, terra preta has more "plant-available" phosphorus, calcium,
sulfur, and nitrogen than is common in the rain forest; it also has much
more organic matter, better retains moisture and nutrients, and is not
rapidly exhausted by agricultural use when managed well. The key to
terra preta's long-term fertility, Glaser says, is charcoal: terra preta
contains up to sixty-four times more of it than surrounding red earth.
Organic matter "sticks" to charcoal, rather than being washed away or
attaching to other, nonavailable compounds. "Over time, it

p.346

partly oxidizes, which keeps providing sites for nutrients to bind to."
But simply mixing charcoal into the ground is not enough to create terra
preta. Because charcoal contains few nutrients, Glaser argued,
"high-nutrient inputs‹excrement and waste such as turtle, fish, and
animal bones‹are necessary." Special soil microorganisms are also likely
to play a role in its persistent fertility, in the view of Janice Thies,
a soil ecologist who is part of a Cornell University team studying terra
preta. "There are indications that microbial biomass is higher in terra
preta than in other forest soils,"
--
- Billy
"When you give food to the poor, they call you a saint. When you ask why the poor have no food, they call you a communist."
-Archbishop Helder Camara
http://peace.mennolink.org/articles/...acegroups.html
http://english.aljazeera.net/indepth...130964689.html