AG-03 · 01 Agriculture
Charged biochar for living soil
Charcoal is not fertilizer. Charged with compost, urine or compost tea, it becomes a sponge for water and microbial life that stays in the ground.
Origin
Amazonian terra preta; contemporary kiln practice
Materials
- Dry woody offcuts
- A simple trench kiln or retort
- Compost, manure or compost tea for charging
Method
- 01
Burn clean, untreated wood with limited oxygen so it chars rather than ashes. Quench when the pieces are black and ringing, not grey.
- 02
Crush to roughly the size of a grain of rice. Dust is wasted; logs will not host life.
- 03
Charge for at least two weeks in compost, a manure pile, or a bucket of compost tea. Uncharged char will steal nitrogen from the bed.
- 04
Work a thin layer into the topsoil or compost — a few percent by volume, not a mulch of black chips.
- 05
Keep a log: which feedstock, which charge, which bed. Biochar is slow. The record is the experiment.
What this makes possible
- Better water holding in sandy or compacted ground
- A use for prunings that would otherwise be burned to ash
- Carbon that remains in the plot instead of the sky
This is a field record, not a permit. Adapt to local law, climate and skill. If you have run this method, send what you learned.