Use of phosphorus fertilizers to reduce bioavailability of Pb, Zn and Cd in a polluted calcareous soil
2001
Nikolov, N. | Zlatareva, E. (Institut po Pochvoznanie "N. Pushkarov", Sofia (Bulgaria))
Some soils in the vicinity of metals smelters near Plovdiv, Kirdjali and Kremikovtsi are polluted with Pb, Zn and Cd. Crops grown on these soils contain high amounts of Pb, Zn and Cd and may be dangerous for the health of the living systems. "In situ" inactivation of heavy metals is the laest expensive method to decrease their bioavailability to plants and other organisms. Our experiments made in the N. Poushkarov Institute of Soil Science during the last several years show, that by applying phosphorus fertilizer and some organic materials to the soil, it is possible to reduce several times the content of Pb, Zn and Cd in a corn plant (zea mays, Kneja 510) grown on a polluted soil which contains 1007 mg Pb/kg, 1137 mg Zn/kg and 17 mg Cd/kg. The efficiency of such treatment of the soil increases in the order Cd, Zn, Pb.
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