A Hydroponic force house was a type of technology used to store and grow plants. A number of them were located and used within the Dalek City of Skaro. (COMIC: The Road to Conflict)
When Bernice Summerfield was trapped in the Dalek City, she found the Daleks' hydroponic farm, surprising her that the Daleks needed food. (AUDIO: The Lights of Skaro [+]Error: Code 2 - no data stored in variables, cache or SMW.)