THE UPTAKE OF CADMIUM, ZINC, ARSENIC AND LEAD BY CHOSEN CROPS

The oat for silage, maize to a height of 90 cm, spring barley and popp y were subsequently planted in luvisols with pH 6.8, CEC 240 mval.kg(- 1), C-OX 2.0% and with the total content of the following heavy metals : Cd 0.73, Zn 154.05, As 58.38 a Pb 43.20 mg.kg(-1). Direct and subseq uent effect of lime, bentonite and manure application on accumulation of Cd, Zn, As and Ph in different parts of growing plants was investig ated. Our results have shown different accumulation of heavy metals in growing crops. The highest concentrations of Cd and Zn were found in the maize biomass, As and Pb were maximum accumulated in poppy capsule s. The total intake of investigated heavy metals by aboveground biomas s was the highest in spring barley for Cd, Zn and As. The highest inta ke of Pb was recorded in maize. The sum of four-year uptake of all hea vy metals was low compared to the total amount of these elements in so il. The only 3.20% of Cd, 1.34% of Zn, 0.17% of As and 0.10% of Pb wer e removed from soil within four years. The application of all three re mediation materials did not have consistent effect on the accumulation of heavy metals in plants. The manure application only decreased Cd c oncentration in biomass for longer time. Positive trend of other two m aterials has not been found in longer period. The amount of released e lements from soil was affected by using extractant. The concentration of all cations decreased in the sequence of HNO3 > DTPA > CaCl2 in the soil. The As release was twice higher by CaCl2 than by DTPA. None of tested extractants showed the closer relationship between released ele ment from soil and the element concentration in plant. The results sho wed difficulties to get positive effect of remediation treatment appli cation in soil neutral in pH, high clay and organic matter content.