This invention consists of a consortium of plant-growth promoting microorganisms including Pseudomonas stutzeri , Pseudomonas denitrificans , Pseudomonas resinovorans , Pseudomonas brassicacearum , Pseudomonas fluorescens , Shimwellia blattae and Klebsiella oxytoca . The bacterial consortium along with a vehicle suitable for agricultural application, form a biofertilizer useful to enhance agricultural yield when applied to cultivation plants. The biofertilizer described present a long shelf life and preserve a high cell density along the time.