A pot experiment was conducted in one of the orchards in Al Salam district at the Diyala governorate during the 2021 agricultural season. The purpose is to investigate the effect of Humic acid and Saccharomyces cerevisiae (bread yeast) on the growth and productivity of the Solanum melongena L plant (eggplant). The study involved plant watering with three concentrations (0, 2, and 4 g.l-1 ) of Humic acid, and leaves spraying with three concentrations of bread yeast (0, 5 and 10 g.l-1 ).