Olive husk “alperujo” is the waste produced during olive oil extraction by the two-phase centrifugation systems (Alburquerque et al., 2004). It is generated in huge amounts (34 million tonnes in Andalusia alone in the 2002–2003 season) and its use as organic amendment for soil reclamation would mean an integrated approach (Romero et al., 2005). Its high concentration of polyphenols and its acidic nature could increase metal solubility in soils (Romero et al., 2005) and therefore enhance metal absorption by plants when using this material as soil amendment. Soluble phenols can chelate heavy metals maintaining them in soluble forms and can highly influence redox processes in soils (McBride, 1987 and Nogales et al., 1997).