Problem to be solved: to provide a method for preparing a hydroponic solution and a hydroponic cultivation method capable of improving the cultivation efficiency and reducing running cost in hydroponic cultivation.Solution: a nitrifying bacterium loaded with an organic fertilizer and a nitrifier carrying water is introduced into the water, and the ammonium ion discharged from the organic fertilizer by the action of the nitrifying bacteria is nitrided to the nitrate ion, and the aqueous solution solution in which the ammonium ion concentration is reduced is prepared. In the hydroponic cultivation method, the hydroponic solution prepared by the preparation method of the hydroponic solution is supplied to the cultivation shelf where the plant is arranged, and the plant is cultivated.Diagram【課題】水耕栽培における栽培効率の向上、ランニングコストの低減が可能な水耕養液の調製方法、水耕栽培方法を提供する。【解決手段】水に有機質肥料及び硝化菌を担持する硝化菌担持炭化物を介在させ、硝化菌の作用により有機質肥料から排出されるアンモニウムイオンを硝酸イオンに硝化させてアンモニウムイオン濃度が低減された水耕養液を調製する。水耕栽培方法では、水耕養液の調製方法によって調製された水耕養液を植物が配置された栽培棚に供給し、植物を栽培する。【選択図】図1
