To provide the technique pursuing positively an effect in accordance with application and practical use, in consideration of such a situation that an effluence accident of liquid substance still occurs and industrial activity has no novelty in countermeasure for properties of the liquid substance as it is.

Heat decomposition granule of plant is provided by causing a prescribed baked granule of diatomaceous earth to contain pyrolysis liquid of plant. Further, pyrolyzed powder of plant is provided by causing a prescribed fired granule of diatomaceous earth to contain pyrolysis liquid of plant. This invention solves problems above described, thereby, grows a district project and facilitates industrial development of the district by practical use of natural resources of a district. Further, the method for producing granule and powder provided by causing a porous material to contain the liquid substance can suppress expensive investment of equipment, using a relatively simple apparatus and performing mass-production by using an agitation mixing technique in a normal temperature operation to provide various kinds of effects.