Effects of N deficiency and salt application on root bio-concentration factors (BCF) and translocation factors (TF) in R. stylosa exposed to mixed metals (100 mg Pb, Zn and Cu per
Kg sand) (BCF ¼ [Metal]root/[Metal]sand; TF ¼ [Metal]leave/[Metal]root) (mean SE, n ¼ 4. Different letters in the same column indicate a significant difference among different
treatments at P < 0.05 as determined by the LSD Test).