[Terrapreta] http://www.thestatesman.net/page.news.php?clid=31&theme=&usrsess=1&id=206962

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 Meanwhile, since the depletion of organic matter in the soil and use of
chemical fertilisers are increasingly becoming problems for farmers,
scientists at Delaware University in the USA — taking a cue from
agricultural practices in the Amazon basin — conducted tests and found that
charcoal derived from biomass, called biochar, increases soil fertility.
The researchers discovered that tribals in the central Amazon basin added
charcoal (from animal bones and the bark of trees) to the soil, which made
it extremely fertile. This method is about 1,500 years old. They presented
the results at the 235th meeting of the American Chemical Society at New
Orleans.
For their experiment, the researchers planted winter wheat in pots of soil
and mixed two per cent biochar generated from tree leaves, corn stalk and
wood chips in some pots and the others contained just soil. They found that
soil with biochar showed improved germination and growth compared to regular
soil. "The improved soil quality has a long-term effect. Once applied, it
will remain for hundreds of years," says Mingxin Guo, the lead author.
Besides being porous and having high nutrient and water retention
capacities, biochar also boosts the carbon retaining capacity of the soil.
This helps check global warming.
According to N Sai Bhaskar Reddy of the Geoecology Energy Organisation,
Hyderabad, using biochar is cost effective. Farmers can be trained to make
charcoal from the biomass available in their fields and surroundings, he
adds. During the traditional slash and burn method used in India, a lot of
"accidental charcoal" is produced. However, not enough charcoal is produced
since the process is not controlled, he says.
Reddy also refers to "charcoal fertilisers" as a novel way of improving the
fertility of all kinds of soils. This prevents wasteful burning of millions
of tonnes of biomass in the open fields after harvesting. Charcoal should be
supplemented with soil microbes, vermi compost, mulch, micro-nutrients,
sand, gypsum, fertilizers, silt, etc, he says.
Using biochar is not restricted to the Amazon basin. People have been using
biochar knowingly or unknowingly in many parts of the world. The need is to
create more awareness about the technique, says Reddy.
— CSE/ Down To Earth Feature Service.

http://www.thestatesman.net/page.news.php?clid=31&theme=&usrsess=1&id=206962
-- 
Michael the Archangel
"Politicians will never solve The Problem;
because they don't realise they are The Problem.".
-Robert ( Bob ) Parsons 1995
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