Coated fertilizer wherein the fertilizer comprises fertilizer particles coated with a biomass composition comprising 1-60 wt. % solid biomass particles with a D50 between 0 and 150 μm and 99-40 wt. % oil, a biomass composition wherein the biomass composition comprises solid biomass particles with a D50 between 0 and 150 μm and a process for the production of a biomass composition wherein a biomass composition comprising solid particles having a D50 between 30 and 500 μm is filtrated and the residue is grinded until the solid particles have a D50 between 0 and 150 μm.