Biochar is a soil amendment that I have wanted to try in my gardens, but figuring out how to make it was a bit of a sticking point. But sometimes when you wait long enough, a simple low tech method will be developed, which makes it much easier to start.

Videos referenced:
How To Make Your Own Charcoal    • How To Make Your Own Charcoal  
Charcoal Retort Kilns and Bio Char    • charcoal retort kilns and bio char  
How to make a small smoke free biochar retort    • Video  
Kon Tiki Biochar Kiln Introduction    • Kon Tiki Biochar Kiln Introduction  
Cone Pit Biochar in 15 Minutes    • Cone Pit Biochar in 15 minutes  

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Part of the Cloughjordan Ecovillage, Tipperary, Ireland http://www.thevillage.ie