Monday, September 29, 2008

The Oil Drum | Terra Preta: Biochar And The MEGO Effect

A substantial review of popular and scholarly literature on terra preta.

The Oil Drum | Terra Preta: Biochar And The MEGO Effect: "Terra Preta ('black earth') was discovered by Dutch soil scientist Wim Sombroek in the 1950's, when he discovered pockets of rich, fertile soil amidst the Amazon rainforest (otherwise known for its poor, thin soils), which he documented in a 1966 book 'Amazon Soils'. Similar pockets have since been found in other sites in Ecuador and Peru, and also in Western Africa (Benin and Liberia) and the Savannas of South Africa. Carbon dating has shown them to date back between 1,780 and 2,260 years."

1 comment:

Erich J. Knight said...

Carbon to the Soil is the only ubiquitous and economic place to put it.

Total CO2 Equivalence:
Once a commercial bagged soil amendment product, every suburban household can do it,
The label can tell them of their contribution, a 40# bag = 150# CO2 = 160 bags / year to cover my personal CO2 emissions. ( 20,000 #/yr , 1/2 Average )

But that is just the Carbon!
I have yet to find a total CO2 equivalent number taking consideration against some average field N2O & CH4 emissions. The New Zealand work shows 10X reductions.

This ACS study implicates soil structure as main connection to N2O soil emissions;

biochar papers at the ACS Huston meeting see Ron Larson's post

Biochar Studies at ACS Huston meeting;



665 - III.


Most all this work corroborates char soil dynamics we have seen so far . The soil GHG emissions work showing increased CO2 , also speculates that this CO2 has to get through the hungry plants above before becoming a GHG.
The SOM, MYC& Microbes, N2O (soil structure), CH4 , nutrient holding , Nitrogen shock, humic compound conditioning, absorbing of herbicides all pretty much what we expected to hear.