Abstract: Method for making of solid fertilizer by separation of liquid manure into a solid and a liquid phase by means of a separating vessel, wherein the charged liquid manure at first is divided into a solid layer and into a liquid phase and from where the liquid phase is fed into a collector vessel, and whereby the solid phase is separated. The duration time of the liquid manure in its resting stage is delayed until the layer formed by the solid phase is separated on the top of the vessel and then the discharge of the liquid phase is carried out through closeable openings.