ResumoCom o objetivo de avaliar o comportamento de frutos de tomateiro submetidos a concentrações crescentes de ácido giberélico (GA 3 ), implantou-se um ensaio no município de Irati-PR, em uma área comercial de tomate cv. Fanny, em setembro e conduzido em sistema de cerca cruzada com uma haste por planta. Os tratamentos utilizados foram: 0, 30, 60, 90 e 120ppm de GA 3 , aplicados quando o diâmetro dos primeiros frutos do segundo cacho atingiu aproximadamente 10mm. Na colheita, quando os frutos apresentavam 30% a 50% de cor vermelha, foram avaliados a massa fresca, comprimento, diâmetros longitudinal e transversal do fruto. A aplicação de 120ppm de GA 3 proporcionou máxima massa fresca e dimensões de frutos de tomate cv. Fanny.Unitermos: ácido giberélico, Lycopersicon esculentum Mill., produção AbstractGibberellic acid contribution to tomato fruit size. With the aim of assessing the behavior of tomato fruits subjected to increasing concentrations of gibberellic acid (GA 3 ), research was carried out in the municipality of Irati, Paraná State, Brazil, within a commercial area of tomato crops, cultivar Fanny, in September under the crossing fence system with a single branch per plant. The adopted treatments were as follows: 0, 30, 60, 90, and 120ppm of GA 3, applied whenever the diameter of the fi rst fruits of the second clusters reached roughly 10 mm. At harvest when the fruits had achieved 30 to 50% of reddish color, the fresh mass, length, and longitudinal and transversal diameters were measured. The application of 120ppm of GA 3 provided maximum fresh mass and dimensions.
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