Response of common bean to Rhizobium reinoculation in topdressing

ABSTRACT The response capacity of the bean to fix atmospheric nitrogen is questionable, mainly due its inability supply all in flowering and grain filling phases when crop needs it most. Thus, a new application inoculant can keep population rhizobia soil at adequate levels, meeting demands plant. This study aimed investigate nodulation production beans submitted doses reinoculation Rhizobium topdressing under field conditions two growth stages. For this, an experiment was conducted using randomized block design with four replicates 4 × 2 + factorial scheme. treatments consisted liquid containing tropici (SEMIA 4088), concentration 109 CFU g-1, (0, 100, 200 400 mL ha-1), development stages (V4 R5) plants, additional (inoculation via seed dose 100 g product per 50 kg seeds mineral fertilization 16 ha-1 applied sowing 60 topdressing, divided into stages, half being stage V3 other V4 stage).The increased rates cultivar BRS Cometa dry biomass produced by 232 221 ha-1, respectively. 257mL stage, inoculation provide greater common yield without supplementing nitrogen.