Desenvolvimento do feijão-comum tratado com Bacillus subtilis

Abstract

The rhizobacteria promote plant growth and control diseases but its action may interfere and/or suffer interference of crop management practices, planted cultivar and environmental conditions. Experiments were conducted to compare the Pérola e BRS Agreste cultivars in two locations (Lavras-MG e Boa Vista-RR) in regard to bean plant development after treatment with preselected rhizobacteria, fungicide or both or Initiate Soy®. Treatments responded differently to environments, with a significant interaction for both locations and among cultivars for the same location, variables related to the development of plant disease control or interaction with microbiota (nodulation). The combination of rhizobacteria with fungicide ensured consistency and stability of results with increases of up to 17% plant population. Nodulation was higher at Lavras compared to Boa Vista and for BRS Agreste compared to Perola cultivars, both planted at Boa Vista and the effect of treatments on nodulation was neutral to positive. The rhizobacteria associated with fungicide reduced by up to 164% incidence of blight in both cultivars. The treatment with ALB629 guaranteed reduction in disease severity until 40DAP (days after planting) while UFLA285 secured control at the first assessment, the 25DAP. For treatment ALB629, the yield was higher than the control in 23 and 489% for Lavras and Boa Vista, respectively. This bacterium (ALB629), without fungicide treatment guaranteed disease control and did not affect nodulation, is therefore an important tool for quantitative improvement of bean production. The use of ALB629 is a plausible strategy for bean seed treatment towards disease control and yield increase.