Fuente: WIPO "tomato" The present invention relates to a method for increasing the production yield of a plant being cultivated in a hydroponic system, comprising (a) adding biochar into the hydroponic system, wherein the biochar is coated with at least one microorganism that along with the biochar promotes the growth of the plant, and (b) culturing the plant in the hydroponic system (a) to obtain products from the plant as well as the use of biochar being coated with at least one microorganism that along with the biochar promotes the growth of a plant for increasing the production yield of the plant when grown in a hydroponic system.