phytoextraction of cadmium, lead and nickel from a contaminated soil by, hordeum vulgar l. and brassica napus l.

heavy metals contamination is a major environmental problem which requires immediate human attention. the use of plant species to remove pollutants from soils, generally defined as phytoextraction. in order to evaluate phytoextraction of contaminated soils, a pot experiment conducted using two plants barley, canola three kinds of heavy metals (cd, pb, ni) with 3 levels in a completely randomized factorial design with three replications. a reverse relationship was found between heavy metal concentration in treatments and biomass production of selected plants. uptake index showed that canola had a better potential for cadmium, lead and nickel phytoextraction.