Desempenho germinativo e vigor de sementes de soja das cultivares olimpo e neo 761 tratadas com cepas microbianas (Bacillus velezensis E Lysinibacillus fusiformis) promotoras de crescimento

Abstract

The use of plant growth-promoting microorganisms has emerged as a sustainable strategy to enhance seed physiological quality and ensure adequate crop establishment. This study aimed to evaluate the germination performance and vigor of soybean seeds from the cultivars Olimpo and NEO 761 treated with different doses of the product Titânico 2 Cepas, containing Bacillus velezensis and Lysinibacillus fusiformis. The experiment was conducted in a completely randomized design with four treatments (control, 3.0, 3.5-, and 4.0-mL kg⁻¹) and eight replications of 25 seeds per treatment for each cultivar. The evaluated variables were germination percentage and root length at 10 days after sowing. The results showed that the product doses did not significantly affect germination for either cultivar, with high values ranging from 96.5% to 98.5%. However, differences were observed in root development: the NEO 761 cultivar showed no significant response to the treatments, whereas Olimpo exhibited a marked increase in root length at the 3.0 mL kg⁻¹ dose, which was statistically superior to the control and to the other doses. It is concluded that Titânico 2 Cepas does not influence germination but can enhance early root vigor depending on the cultivar and applied dosage, with 3.0 mL kg⁻¹ being the most effective concentration for Olimpo. These findings highlight the relevance of cultivar-specific responses in bioinoculant recommendations and contribute to advancing sustainable soybean seed treatment practices.