For plants, the addition of the soil parameters in the regression
models greatly improved the estimation of Cr and Ni accumulation.
The main variables influencing the accumulation of these metals were
the SEC for Cr, the pH for Pb and pH coupled with silt content for Ni.
On the other hand for As multiple regression model did not improve
the estimation of accumulation in plants, as compared with simple
models (using either total or “available” contents in soil). Lastly, for
Cd, Cu and Zn no statistically significant regression was found, suggesting that accumulation of these metals in plants was not dependent on
the soil parameters for the set of plot studied.