ABSTRACT The research about concentration of Vittana the effect frequency and the yield of the shallots (Allium ascalonicum L.) was carried out at Tidar Village, South Magelang Districh, Magelang Regency, Central Java, from February until April 1993. The altitude of 368 soil type is Regosol, with pH 6. The purpose of the research is to know the effect frequency and…