PROBLEM TO BE SOLVED: To solve the problem that lamination stage number of cultivation shelves is limited because weights of water or culture solution, and light sources, are heavy, or high construction cost is caused in order to secure the strength of a cultivation building.SOLUTION: In a hydroponic culture apparatus, water is sequentially fed to a water supply line so that the water supply line has a full water state and a small water quantity state to decrease a total amount of water or culture solution. Carbon dioxide is absorbed into a plant root between a cultivation board and the water supply line, which is promoted by swinging the plant root caused by a water stream so that cultivation becomes possible with a small light amount to decrease a weight of light sources.【課題】水または培養液及び光源の重量が大きいことに基づき、栽培棚を積層する段数が制約される、もしくは、栽培用建物の強度を得るためにコスト高になるという問題を解消する。【解決手段】給水路に逐次に給水していく。これによって給水路に満水状態と小水状態を持たせることによって水または培養液の総量を減らす。また、少ない光量で栽培することを可能として光源の重量を減らす。このために、栽培ボードと給水路の水面との間において根に二酸化炭素を吸収させ、水流によって根を揺らす。【選択図】図１
