Biochar is a 2,000 year old practice of supplementation for plants.
It is made from charcoal powder mixed with liquid goodies like worm tea.
The benefits are:-
* soil enhancing - holding carbon, retaining nutrients and water
* food security boosting
* increasing soil biodiversity
* discouraging deforestation
Part 1 ~ first make the charcoal.
Love the photo of the flame issuing from the air-hole. Marvellous fire activity. Do you do anything to show children about sustainability? (I know, I know - health and safety!)