PROBLEM TO BE SOLVED: To provide a hydroponic device with which optimum conditions on density, temperature and the like for culture liquid preliminarily adjusted and supplied can be maintained in a cultivation tank and the culture solution can be uniformly supplied, and nutrients, oxygen and environment are properly and stably given to cultivated crops.SOLUTION: The hydroponic device includes at least a cultivation tank 10 and a cultivation bed 20, supplies the adjusted culture solution into the cultivation tank 10, makes the culture solution constantly circulate in a flow condition and enables adjustment of the water level of the culture solution. The device is structured as follows: a plurality of liquid supply openings 31 for supplying the culture solution into the cultivation tank 10 are disposed on the longitudinal one side of the cultivation tank 10 at intervals, and a plurality of drainage openings 41 for draining the culture liquid from the inside of the cultivation tank 10 are disposed on the longitudinal other side of the cultivation tank 10 at intervals so as to make the flow direction of the culture liquid flowing in the cultivation tank 10 correspond to a lateral direction and the number of times of exchanging the culture solution in the cultivation tank 10 is adjusted to be within 1-10 times per 1 h.COPYRIGHT: (C)2012,JPO&INPIT【課題】予め調整されて供給された培養液の濃度、温度等の最適な培養液条件の栽培槽内での維持と均一な供給を可能とし、栽培作物に対する適正な養分提供、酸素提供、環境提供を安定して行うことが可能な養液栽培装置の提供を課題とする。【解決手段】栽培槽10と栽培床20とを少なくとも備え、調整された培養液を栽培槽10内に供給し、培養液を常に流動状態に循環させると共に培養液の水位を調節可能とした養液栽培装置であって、栽培槽10内への培養液の給液口31を、栽培槽10の長手方向に沿う一側に間隔をもって複数配置すると共に、栽培槽10内からの培養液の排液口41を、栽培槽10の長手方向に沿う他側に間隔を持って複数配置し、これにより栽培槽10内を流れる培養液の流れ方向を短手方向になるように構成し、加えて栽培槽10内の培養液の入れ替わり回数を1時間当たり1~10回の範囲となるように調節する構成とした。【選択図】 図1
