PROBLEM TO BE SOLVED: To provide a hydroponic device which hardly causes root rot, is capable of allowing fertilizer to be contained in water automatically during operation even when normal water containing no fertilizer is used, and efficiently growing plants.SOLUTION: A hydroponic device is equipped with: a culture tank 1 which supports a plant A a liquid tank 2 which is installed under the culture tank 1 and in which culture solution B is pooled culture solution transfer means 3 which connects the culture tank 1 with the liquid tank 2. The culture solution transfer means 3 alternately performs, every predetermined time, culture solution supply in which the culture solution B is supplied from the liquid tank 2 to the culture tank 1 and culture solution discharge in which the culture solution B is discharged from the culture tank 1 to the liquid tank 2, a discharge port 5 which drops the culture solution B toward the liquid tank 2 when the culture solution B in the culture tank 1 exceeds a fixed depth is formed at the top portion of the culture tank 1, and in the liquid tank 2, granular soil containing fertilizer is housed in a receiving portion of the culture solution B dropped from the discharge port 5.COPYRIGHT: (C)2014,JPO&INPIT【課題】根腐れを起こし難く、肥料を含まない普通の水を用いても運転中に自動的に肥料を水に含有させることができ、効率良く植物を栽培できる水耕栽培装置の提供。【解決手段】植物Aを支持する栽培槽1と、栽培槽1の下方に設置され、養液Bが貯留される液体タンク2と、栽培槽1と液体タンク2を接続する養液移送手段3とを備え、養液移送手段3は、液体タンク2から栽培槽1へ養液Bを供給する養液供給と、栽培槽1から液体タンク2へ養液Bを排出する養液排出とを所定時間ごとに交互に行ない、栽培槽1の上部に、栽培槽1内の養液Bが一定深さを越えた時、養液Bを液体タンク2に向けて落下させる排出口5を形成し、液体タンク2において、排出口5から落下する養液Bの受入れ部に、肥料を含有した粒状土が収納されている。【選択図】図1
