PROBLEM TO BE SOLVED: To provide a device which solves a problem in supplementation of air with water for growing plants, which has never been discussed precisely in a conventional system for hydroponics, and supplies water for growing plants with air more uniformly, as disclosed in an embodiment of the present invention.SOLUTION: The hydroponic device of the present invention comprises: a tank for hydroponics storing water therein, in which roots of a plant in water are grown and a water repellent sand layer which contacts with the water, being made of a plurality of particles subjected to water repellent treatment. The hydroponic device has either of conditions where a part of the water repellent sand layer contacts with air or where the hydroponic device comprises a pump which supplies the water repellent sand layer with air. The air in the water repellent sand layer is supplied to the water from the surface which contacts with the water.COPYRIGHT: (C)2014,JPO&INPIT【課題】従来技術に係る水耕法栽培システムでは、植物を育成する水への空気等の供給についての詳細な検討がされていない。本発明の1態様に係る形態は、植物を育成する水により均一に空気を供給する装置を提供する。【解決手段】本発明の水耕栽培装置は、内部に水を貯蔵し、前記水の中で植物の根が育成される水耕栽培用タンクと、前記水と接触するように形成され、かつ、撥水処理された複数の粒子で形成されている撥水砂層とを備え、前記撥水砂層の一部が空気と接しており、又は、前記撥水砂層に空気を供給するポンプさらに備えており、前記撥水砂層の内部の空気は前記水と接触する面から前記水に供給される。【選択図】図3
