ABSTRACT An experiment concering the dose of gamma rays radiation and colchicine concentration on yield of shallot (Allium ascalonicum L) cultivare Bima had been conducted at Sudimoro Vallage, Srumbung District, Magelang Regency, Central Java Province, Kind of soil is regosol, the soil pH 5,7. The radiation of bulb had been done at BATAN Jakarta. The research uses (4x4…