Fuente: WIPO "organic farming" A process to make a nitrogen-enhanced yeast-based fertilizer, said process comprising the steps of: —providing a live yeast (BSY) in solution; —exposing said live yeast to a nitrogen-containing compound to a carbohydrate and an enriched nitrogen source such as an amino acid, a protein or the like thereby creating an incubation mixture; —injecting air in to the incubation mixture so as to inhibit the production of ethanol; wherein said incubation mixture undergoes incubation for a period of time sufficient for said yeast to metabolize said nitrogen source and for said yeast to propagate and store the supplied nitrogen source in their vacuoles resulting in a nitrogen-fed yeast mixture; —hydrolyzing (or autolyzing) the resulting nitrogen-fed yeast mixture under specific conditions; and —optionally followed by a dehydration or evaporation step, to meet pre-determined specifications.