ABSTRACT The aim this exsperiment was to know the effect Ato nik concentration to the tomato production (Lycopersicum esculentum Mill). The exsperiment have been carried on August until November 1988 out at Pandean, Banyubiru, Du kun, Magelang, Central Java. The type soil was Regosol, PH 6,0 at an altitude of 450 meters. This exsperiment used Radomized Completelly Block De- sign M…