The effects of soil solarization and the growth promoter rhizobacteria, Pseudomonas fluorescens P190 on tomato (Lycopersicon esculentum), grown under greenhouse conditions, were evaluated in 2006 and 2007. A trial was performed according to a factorial arrangement, using “solarization” and “pseudomonas” as factors and “presence” and “absence” as levels for each factor. Eight variables were recorded in order to evaluate treatments effect: weight and diameter of each fruit -disregarding those showing either damage or less than commercial size- as well as root, stem and leaf fresh and dry weight. Main component analysis was used to characterize experimental units as regards the presence or absence of the studied factors. ANOVA analysis and LSD means comparison test results showed that, both solarization and seed inoculation by themselves, increased crop yield by 15 % when considered separately. When combined, a synergistic effect was apparent, and crop yield was increased by 55 % as related to the control treatment.