PROBLEM TO BE SOLVED: To provide a nutritious liquid supply system for plant cultivation capable of stably and forcedly flowing and circulating nutritious liquid in a configuration utilizing air pressure produced by a blasting pump to feed the nutritious liquid.SOLUTION: A nutritious liquid supply system for plant cultivation comprises: a nutritious liquid tank 1 configured as an airtight container having a capacity enough to store and circulate nutritious liquid required by a plant cultivation base part 6； an air supply pipe 3 connected to a position where an air pressure P on a liquid surface in the nutritious liquid tank 1 acts； a blasting pump 2 connected to an air blowing port side of the air supply pipe 3； a liquid feeding pipe 5 whose intake port is connected to a deep position under the liquid surface in the nutritious liquid tank 1, and which is installed to lead a nutritious liquid 4 to the inlet side of the cultivation base part 6； and a liquid tank 7 into which the nutritious liquid 4 having flowed and circulated in the cultivation base part 6 is discharged from an outlet 8a, and which recovers and stores the discharged liquid. The nutritious liquid supply system for plant cultivation also includes: a check means 10 for communicating the liquid tank 7 with the nutritious liquid tank 1 and for preventing the nutritious liquid from flowing back to the liquid tank 7 from a communication part 9； and a drive control part 11 for the blasting pump 2.【課題】送風ポンプが発生する空気圧の作用を養液の送り作用に利用した構成により養液の強制流動と循環を定常に行なわせる植物栽培用の養液供給系統システムを提供する。【解決手段】植物の栽培ベース部６に必要とされる養液を収容し循環させる容量を有する気密容器構造の養液タンク１と、養液タンク１の液面上の空気圧Ｐを作用させる位置へ接続した空気供給パイプ３と、空気供給パイプ３の送風口側へ接続された送風ポンプ２と、養液タンク１の液面下の深い位置へ取り入れ口を接続され、養液４を栽培ベース部６の入り口側へ導く配置に設置された給液パイプ５と、栽培ベース部６内を流動、循環した養液４を出口８ａから排出させ、その排液を回収し収容する液槽７とで成り、液槽７と養液タンク１とを連通させ、連通部９から液槽７へ養液が逆流するのを止める逆止め手段１０が設けられ、送風ポンプ２の駆動制御部１１を備えている。【選択図】図１
