"chemical composition." . . "nitrogen." . . "metallic elements." . . "picea abies." . . "pellets." . . "pulp and paper industry." . . . . "leaching." . . "logging wastes." . . . . . . . . . . . . . . "From wood to waste and waste to wood : aspects on recycling waste products from the pulp mill to the forest soil" . . . . . . . . . . "forest soils." . . "ashes." . . "nutrient availability." . . "recycling." . . "stems." . . "heat treatment." . . "organic matter." . . "carbon." . . "soil fertility." . .