ABSTRACT The research was conducted from May until August 1988 at the "Balai Benih Utama Kedu, Temanggung, Central Java, The type of soil was Letosol, pH 6,0, at an altitude of 650 meters. The purpose of the research was to find out the influ- ence of combined treatments of different concentrations and moments of application of triacontanol to the tomato crop (Lycopersicum escul…