Resumen
- The genus Azotobacter is a group of bacteria able to stimulate and promote plant growth in multiples crops, and additionally possess the capacity of asymbiotic nitrogen xation [1]. In the present work, the biomass production of two indigenous strains of A. chroococcum (named Ac1 and Ac10) using liquid fermentation for the further production of a biofertilizer was evaluated. For that, a liquid culture medium previously optimized (coded as MBR) was used for a fermentation process. Initially a batch type strategy was applied for generating a baseline. Later, in order to increase process eciency (expressed as energy consumption and productivity), the eect of fed-batch feeding strategy with a reduction of the stirring speed was evaluated while air ow and culture time were maintained constant. Key words: liquid fermentation, fed-batch process, Azotobacter chroococcum