The invention relates to a stable humus-water storage hybrid comprising an organic fertiliser consisting of lignite treated in an oxidising and ammoniating manner and at least one water-storing component selected from materials of a mineral or organic origin, the proportion of the organic fertiliser amounting to 0.5-99.9 vol. %, preferably 1.0-90.0 vol. %, and the proportion of the at least one water-storing component amounting to 0.1-99.5 vol. %, preferably 10.0-99.0 vol. %. The invention also relates to a method for producing the stable humus-water storage hybrid and to the use thereof as a plant substrate, an additive for vegetable mould and an additive for soil.
