The aim of the experiment was to determine the effects of cow manure and olive husk on the bioavailability of heavy metals in a calcareous contaminated soil, and the feasibility of their use for phytoremediation. Two heavy metal indicator species, namely, Beta vulgaris L. and Beta maritima L., were selected for testing changes in metal availability due to the amendments ( McGrath et al., 2000 and Walker et al., 2003). Since B. vulgaris is a common crop of the Murcia Region and B. maritima is also consumed, these are appropriate species for assessment of the risk to crop plants from the spread of contamination into arable soils from adjoining contaminated sites.