CRITERIA OF BIOACCUMULATION OF TOXIC ELEMENTS AS A HYGIENIC INDEX OF CROP PRODUCTION QUALITY

N.A. Rizhenko, V.N. Kavetsky

The heavy metals row of the spring barley up-taking intensity was determined: Cd > Cu > Zn > Pb. According to plant up-taking criteria the most dangerous metal was cadmium and least dangerous metal was lead. The pattern of Cu, Zn, Pb irregular localization in different phytomass fractions was determined. It was defined that heavy metals contain was decreasing in raw: subterranean phytomass > generative phytomass (grain) > vegetative phytomass (straw). Heavy metals total plant up-taking coefficients depending on different soil pollution levels were determined: Cd 0,54—0,66; Cu 0,45—0,51; Zn 0,26—0,3; Pb 0,15—0,16. Spring barley grain up-taking coefficients were Cd 0,13—0,15; Cu 0,08—0,09; Zn 0,04—0,05; Pb 0,02. Plant up-taking coefficients was a ground of the either crop products quality hygienic assessment or metal's danger evaluation.

Constants of spring barley phytofiltration were calculated by the exponential pattern. Constants of metal's up-taking by total phytomass were Cd — 0,79; Cu — 0,49; Zn — 0,26; Pb — 0,19 year^-1; by grain were Cd — 0,70; Cu — 0,33; Zn — 0,36; Pb — 0,190 year^-1. It gives the possibility to forecast the metal's quantity in total phytomass or grain a certain time term at the following crops vegetative period.

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