The accumulation of heavy metals in plants (Lactuca sativa L., Fragaria vesca L.) after the amelioration of coalmine tailing soils with different organo-mineral amendments

The investigation was based on two pot experiments with lettuce and strawberry, aiming to assess the uptake of heavy metals (cobalt [Co], chromium [Cr], lead [Pb], cadmium [Cd], nickel [Ni], arsenic [As]) from coalmine tailing soils subjected to different amelioration measures (application of liquid fertilizers combined with different organo-mineral materials - zeolite material, peat material, coal dust and poultry manure processed by flies' worms). The results obtained indicate the problem of high Cr and Ni accumulation in above ground parts of plants (leaves and fruits). The question of Cr mobility within substrates and plants stayed open. Concentrations of Ni and Cr in lettuce and strawberry are below the levels allowed for animal food, but could influence daily human intake. Further work should focus on the mobility of heavy metals within treated tailings and their uptake by different plant species