[Terrapreta] cheap source of char?

[Gerald Van Koeverden]

A neighbour of mine has a swampy area that "smoked" for years, even  
though it was being farmed.  I wonder if such naturally-charred  
products would be useful for soil amending?   He has noticed that  
yields are poor at the center of If, but that plants do better at its  
edges, where charred plant material makes up only part of the soil  
mixture.

If such areas have sufficient potential - by being dug up and spread  
around,  it would open up a whole new source of locally available  
materials for use in improving soil fertility.  Though some muck bogs  
have been extremely productive agriculturally for high-end  
horticultural crops, many are useless after being drained, because of  
the extremely high acidity.

Gerald