PROBLEM TO BE SOLVED: To provide a solution culture system stably increasing the sugar content of a fruit vegetable or fruit, controlling the temperature of root within a moderate range, and increasing the yield throughout the year.SOLUTION: The solution culture system includes a cultivation bed 1 in which a nutrient solution flows, a plurality of cultivation pots 2 disposed in the cultivation bed and planting seedlings to be cultivated therein, and a nutrient solution circulating/supplying system for supplying the nutrient solution in the cultivation bed. The cultivation pot 2 is formed with an opening portion 3 in the bottom, the opening portion is closed with a sheet-shaped member 4 passing the nutrient solution but not passing the root of vegetable therethrough. The nutrient solution circulating/supplying system has a circulation tank 7 for storing the nutrient solution, a pump 9 for supplying the nutrient solution in the circulation tank into the cultivation bed at a flow rate sufficient to constantly immerse the lower part of the cultivation pot, temperature adjusting units 19 and 20 for holding the nutrient solution in the circulation tank at a predetermined temperature range, and concentration adjusting units 12a, 12b, 17, and 18 for changing the concentration of the nutrient solution in the circulation tank.【課題】安定的に果菜又は果実の糖度を高めることができ、さらに根の温度を最適範囲内に制御することにより、年間を通しての収量も増加させることが可能になる養液栽培システムを提供する。【解決手段】養液が流れる栽培ベッド１と、この栽培ベッド内に配置されるとともに栽培すべき株の苗が植設された複数の栽培ポット２と、栽培ベッドに養液を供給する養液の循環供給システムとを備え、栽培ポット２は、底部に形成された開口部３が、養液を通し、かつ株の根を通さないシート状部材４によって塞がれており、養液の循環供給システムは、養液が蓄えられた循環タンク７と、循環タンク内の養液を栽培ベッド内へ常時栽培ポットの下部が浸る流量で供給可能なポンプ９と、循環タンク内の養液を予め設定された温度範囲内に保持する温度調節手段１９、２０と、循環タンク内の養液の濃度を変化させる濃度調整手段１２ａ、１２ｂ、１７、１８とを有してなる。【選択図】図１
