un site mondial : https://biochar-international.org/
https://biochar-international.org/open-source-biochar-technologies/
https://terrafertilis.com/
https://www.plantezcheznous.com/professionnel-jardin/la-carbonerie-producteur-de-biochar-de-premiere-qualite/
BIOCHAR
https://www.insectosphere.fr/biochar-charbon