Abstract: A method of efficiently supplying terrestrial plants with raising substances such as a solution comprises the steps of: producing a solution by an electrolysis of a water using a carbonaceous electrode; reducing the produced solution to minute particles or fine spray; and supplying the solution to the terrestrial plants including leaves entirely. An apparatus includes a container for storing water having at least a water inlet and a water outlet; a pair of electrodes comprising an anode and a cathode provided in the container, at least the anode being made of composition of carbonaceous materials and cured resins and molded into a plate-like form; a power supply to supply an electric current between the pair of electrodes to produce a solution by an electrolysis of the water; and a pump connected with the water outlet in the container for supplying the solution to the terrestrial plants.