Charcoal is very useful for plants. It is extremely absorbent to anything, specially nutrients in the soil so they don't get washed away by rain or irrigation.

Charcoal is very useful for plants. It is extremely absorbent to anything, specially nutrients in the soil so they don't get washed away by rain or irrigation. it releases them slowly. I have done tests myself with very small quantities, 50 or so plants, half of those without, half with it, and plants certainly improve a lot. We need scientific studies of thousands and thousands of plants for info about the combination of all those things. It will require several disciplines, like genome extraction from soil, computer science to identify the microorganism present, lots of sensors for humidity, temperature, ph and so on.