Fuente: WIPO "organic farming" The present invention relates to a method for improving nutrition of plants with one or more minerals, comprising the administration of at least one ammonium source A, at least one bacteria or fungal species B with phosphate-solubilizing and/or root growth-promoting properties, and at least one nitrification inhibitor C to a substrate S on which the plants are cultivated or intended to be cultivated. Further, the present invention relates to a composition and a kit usable for this purpose.