Abstract
The investigations carried out by the botanical section of the Lower Swansea Valley Project have shown that when suitable treatments are used, a vegetation cover can be established on the slag tips of copper and zinc smelting industries (Weston et al. 1965; Street & Goodman 1967). Because the study was of short duration, very little information was gained about the permanence of such a cover, but it appeared that the most promising treatments would be expensive since they involved the use of bulky organic materials which are costly to transport. Toxic elements and adverse physical conditions may both restrict natural recolonization of the slag heaps, and their relative importance is difficult to determine. In addition certain essential nutrients are probably lacking. The work already reported was carried out with plant species chosen primarily for their resistance to adverse physical conditions and/or their low nutrient requirements.
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