The present invention can be provided with nutrients necessary for the growth even if the nutrient concentration in the nutrient solution is reduced continuously to the plant in the growth process of plants, the water to secure the quality stabilization of the nutrient solution to provide a hydroponics system. A cultivation tank 1, cultivation shelf 2 to support the plant M, reservoir 3 to keep storing the nutrient solution W, a nutrient solution W in the cultivation tank 1 between the reservoir 3 and cultivation tank 1 A hydroponic apparatus A constituted to include a nutrient solution circulating device 4 that circulates, cultivation shelves 2 via the solid medium 9 is allowed to support the plants M, and, by providing the zeolite 10 for cultivation tank 1, a plant In except when top-dressing in the growth process of the M it gives the nutrients necessary to continue the growth of the plant M. Also, to ensure a gap portion 8 between the liquid surface of the lower surface and hydroponics W cultivation shelves 2, and suppresses the generation of algae and promote the quality stabilization of the nutrient solution W. .BACKGROUND【課題】植物の生育過程において養液中の養分濃度が低下した場合であっても生育に必要な養分を植物に継続的に与えることができ、養液の水質安定化をより確実にする水耕栽培装置を提供する。【解決手段】栽培槽1、植物Mを支持する栽培棚2、養液Wを貯留しておく貯液槽3、貯液槽3と栽培槽1との間で栽培槽1に養液Wを循環させる養液循環装置4を備えてなる水耕栽培装置Aであって、栽培棚2に固形培地9を介して植物Mを支持させ、かつ、栽培槽1にゼオライト10を設けることで、植物Mの生育過程における追肥時以外においても植物Mの生育に必要な養分を継続的に与える。また、栽培棚2の下面と養液Wの液面との間に空隙部8を確保することで、藻の発生を抑止し、養液Wの水質安定化を図る。【選択図】図1
