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This article is devoted to the assessment of toxic effect of benzo[a]pyrene (BaP) on spring barley (Hordeum sativum distichum) grown in background control Haplic chernozem and that spiked with various doses of BaP (20, 200, 400 and 800 ?g/kg) equivalent to 1, 10, 20 and 40 levels of maximal permissible concentrations (MPC). The experimental soil samples were planted every spring and incubated outdoor during 4 years. During the experimental time (almost 4 years), concentrations of BaP decreased by 80-87% in the soi...