PROBLEM TO BE SOLVED: To provide Wasabia japonica cultivation systems capable of supplying moderate sunshine and cool cultivation water in order to cultivate Wasabia japonica, a semi-shade plant.SOLUTION: A solar panel is attached as a roof of a sunlight-utilizing plant cultivation house, sunlight energy is utilized maximally in a little amount of light of 20% to 30% and water as cool as possible is supplied to a water tank in which Wasabia japonica is cultivated, by storing rain water which is falling on the solar panel in an underground tank through an underground septic tank, so as to enable variety of plant hydroponics from sun plants to shade plants. Water is supplied from the upper part of the water tank into the water tank in which Wasabia japonica is cultivated, and is drained from the lower part so that water is always flowing. Additionally, Wasabia japonica strains are arranged in exclusive cultivation pots one by one and are sunk in the water tank so that the upper side of the river sand in the cultivation pot is lower than the water surface by 2 cm. Water is drained from the bottom of the cultivation pot apart from the drainage of the water tank to make the water flow from the upper side to the lower side for every cultivation pots.SELECTED DRAWING: Figure 1【課題】半陰性植物の水わさびを栽培するのに適度な日照と清涼な栽培水の供給を可能とする水わさび栽培システムを供給する。【解決手段】太陽光利用型植物栽培ハウスの屋根として太陽光パネルを取り付け陽性植物から陰性植物までの多種の植物水耕栽培が出来る様に２０％～３０％の少ない光量の中で太陽光のエネルギーを最大限に利用し、水は太陽光パネルに降り注ぐ雨水を地下の浄化槽を経て、地下タンクに貯蔵し、少しでも清涼な水にして水わさびを栽培する水槽に供給する。水わさびを栽培する水槽には上部より給水し、下部より排水をし、常時水の流れを創り、更に、水わさび一株ずつ専用の栽培ポットに活け、栽培ポット内の川砂上面が水面より２ｃｍ程低くなるよう水槽に沈め、水槽の排水とは別に栽培ポットの底部より排水をし、栽培ポット毎に上から下へ水の流れを創る。【選択図】図１
