ABSTRACT The research entitled "The effect of concentration Gibgro-T and kind of media of plant cucumber (Cucuis sativs, L.) on hydroponics system had been carried out in November 29, 1999 to January 6', 2000. The research was in Green house of SMK Negeri 1 Salam, Magelang Regency. The altitude is 300 meters. The method of experiment is factorial experiment (3 3) on Complet…