cultivation method according to one or more embodiments of the present invention is a cultivation method which uses beneficial micro organisms such as mycorrhizal fungi and their partner bacteria further it uses an intercropping method that allows an intercropping plant partner plant which enables easy growth of the mycorrhizal fungi and their partner bacteria to grow between rows of a crop by using such a method of use and a hydroponic cultivation apparatus capable of creating an environment under which the beneficial micro organisms are easy to grow the yield and quality of the crop can be increased thereby making it possible to avoid using chemical fertilizers or chemically synthesized agrochemicals or to reduce their use amounts the mycorrhizal fungi may specifically be arbuscular mycorrhizal fungi amf that creates a symbiotic relationship with substantially all plants so that upon seeding or planting cuttings before the commencement of hydroponic cultivation treatment is conducted with an inoculum with mycorrhizal spores contained therein to infect the crop and intercropping plant with the inoculum beforehand one to two weeks after the inoculation that mycorrhizal formation was observed seedlings of the crop are wrapped with sponge and are embedded and transplanted in holes of a polystyrene foam for a hydroponic cultivation.