A ground or soil working device having tools to separate and comminute organic materials, tools to serate by holing and crumble the top surface and mix in the comminuted organic material, has the seration holing tools (4) attached in relation to the comminution tools (10) such that the chopped up material (18) is directed away by the cultivator prongs (4). Additional guide devices may partially or totally deflect the chopped material (18) away from the prongs (4). The surface crumbling and mixing tools (5) are attached in such a way that a mixing space (19) is formed between them and the other tools in which material excavated by the tools (4, 5) can be premixed with chopped material (18).
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