Bacillus sp. como promotor de crescimento em soja Bacillus sp.

Abstract

Plant-growth promoting rhizobacteria have been gaining ground in world agriculture as an alternative to the use of chemical pesticides. Soy, being one of the main grains exported by Brazil, deserves attention in studies of this scope. Some bacteria already have their growth potential and biocontrol established by studies. Thus, soybean seeds (Glycine max L.) were inoculated with Bacillus sp. aiming to evaluate the viability of rhizobacteria as a plant growth promoter. Four treatments with different doses of Bacillus sp. inoculant were tested: 100, 200, 300 and 400 mL of inoculant for 50 kg of seeds, with a concentration of 1x108 CFU mL-1, plus one control without inoculation. The analyzes were made at 30 and 45 days after planting (DAP). At 45 DAP, plant height, root length, shoot dry mass, root dry mass and total dry mass were statistically higher for all applied doses when compared to the control. The number of internodes also increased significantly in the different doses used, compared to control treatment. Inoculation of seeds with Bacillus sp. was a viable alternative for growth promotion in soybean plants.