Commercial biochar fromwood residues (e.g., teak (Tectona
grandis L.) and rosewood (Pterocarpus macrocarpus Kurz)) of a local
lumbermill was used in these experiments. Wood residues were
processed into biochar by the earth mound method (FAO, 1983).
Biocharwas ground to 2 mmparticle size, then applied and carefully
mixed with the soils after plowing.