The present invention primarily relates to a preparation comprising or consisting of 40-99.9 wt.-% of lignin, preferably unmodified lignin, 0.1-50 wt.-% of minerals, preferably 0.1-30 wt.-%, 0-25 wt.-% of one or more mono- and oligomeric carbohydrates, preferably 0.1-20 wt.-%, and 0-15 wt.-% of one or more solvents, in particular water, preferably 0.1-4 wt.-%. Furthermore, the present invention relates to a fertilizer comprising or consisting of such a preparation and to the use of such a preparation as fertilizer, as ingredient for a fertilizer or for producing a fertilizer.
