Remediation refers to processes or methods for treating contaminants in soil or water such that they are contained, removed, degraded, or rendered less harmful (Pierzinsk et al., 2000). Use of chemical amendments is one approach for immobilization of the natural or added metals. Lime, FYM and phosphatic fertilizers have been used extensively for detoxification of the dreaded heavy metals in soil plant system. Chemical immobilization of heavy metals by the application of ameliorants like lime, farm yard manure (FYM), phosphates, iron oxides, manganese oxides, zeolites etc. among these, soil excavation is the only method for the total removal of heavy metals from contaminated soil. However, it cannot be recommended as a viable practice, since it is prohibitively expensive. The phytoremediation also takes a long period to remove a substantial quantity of heavy metals from contaminated soils. Thus, a logical and rational remediation process appears to be to render the metals immobile by using different amendments. Use of plants which are hyper accumulators of metals like Brassica Species for phytoremediation of polluted soil.
