Search for: [Abstract = "In the vicinity of Olbrachtów near Żary reclamation of clay excavation was carried out by filling them up with wood wastes, mainly pine bark. After levelling the surface with bulldozers, 20 cm of clay was spread out and after this the spruce cutting were planted. The investigations have shown, that after 10 years only small changes in the \"soil\" sections occur, and the spruce seedlings were still overgrowth by grasses and herbs."]

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