Plenty of good stuff on YouTube searching "agrichar" and "biochar."

The huge potential of agricultural soils to reduce greenhouse gases and increase production at the same time has been reinforced by new research findings at NSW Department of Primary Industries’ (DPI) Wollongbar Agricultural Institute in Australia.

Trials of agrichar - a product hailed as a saviour of Australia’s carbon-depleted soils and the environment - have doubled and, in one case, tripled crop growth when applied at the rate of 10 tonnes per hectare.