Development of soybean cultivars after inoculation with strains of Bacillus subtilis

Abstract

Diasotrophic bacteria in agriculture can promote increases in crop productivity. This study aimed to evaluate the effect of different concentrations of Bacillus subtilis rhizobacteria inoculants on the initial development of two soybean cultivars. Two experiments were conducted with commercial soybean varieties, M8210 and TMG132, evaluated at 15, 30 and 45 days after sowing (DAS). In each experiment, two products were applied in the treatment of seeds, a Bacillus subtilis strain pant001 at concentrations of 0, 2, 4, 6 and 8 mL kg(-1), and the additional treatment with a commercial protective fungicide, which also has Bacillus subtilis strain QST713 in its formulation at the recommended dose of 2 mL kg(-1). The leaf chlorophyll content index of the upper, middle and lower canopy was evaluated at 15, 30 and 45 DAS, height of plants, fresh and dry mass of the aerial part of the plants, fresh and dry root mass and volume roots at 30 and 45 DAS. The results indicated an increase in the Spad index of leaf chlorophyll of both varieties with increasing doses of Bacillus subtillis pant001, but the inoculation had no effect on the attributes of the aerial part of the plants. In the TMG132 variety, there was an increase in fresh shoot mass after 30 DAS and root volume at 45 DAS.