HEAVY METALS CONCENTRATIONS IN DACTYLIS GLOMERATA L. PLANTS IN AN EXPERIMENT WITH INDUCED POLLUTION SOIL IN THE GREEN HOUSE

Abstract

This study presents the results of experiments with induced pollution, carried out in the greenhouse, which aimed at the accumulation of heavy metals (Cd, Pb, Zn and Cu) in Dactylis glomerata L. plants. The soil material used for the experiments was harvested from an unpolluted area in the Copșa Mică area. The soil has a fine texture, with a weak alkaline reaction, a medium humus content, a medium nitrogen and potassium supply and a high phosphorus content. The heavy metal contents fall within the normal limits according to Order 756/1997 on the assessment of environmental pollution. To carry out the experiments with induced pollution, the soil material was treated with the appropriate amounts of metals (Cd, Cu, Pb and Zn) from their soluble salts (acetate), and for each element 6 experimental variants were established depending on the metal content in the soil.
The results obtained were used to parameterize stochastic models that can be used to estimate the accumulation of heavy metals in Dactylis glomerata L. plants depending on the total and mobile (DTPA) content of metals in the soil. The logarithmic plots for the power regression curves estimating the stochastic dependence between the total and mobile content in the soil and aerial part of Dactylis Glomerata L. plants are distinctly statistically significant.