Accumulation of Copper, Zinc, Cadmium and Lead and Distribution within Organs of Cotton Cultivars, Grown in Metal-Contaminated Soil

V. DELIBALTOVA and B. YANKOV
Agricultural University, Agricultural Faculty, Department of Crop Science, BG-4000 Plovdiv, Bulgaria

Abstract

DELIBALTOVA, V. and B.YANKOV, 2006. Accumulation of copper, zinc, cadmium and lead and distribution within organs of cotton cultivars, grown in metal-contaminated soil. Bulg. J. Agric. Sci., 12: 43-49

The purpose of the research was to establish the accumulation of five Bulgarian cotton cultivars to different concentrations of heavy metals in the soil, as well as the distribution of copper, zinc, cadmium and lead in the plants organs.
In order to accomplish our purpose, we set pot experiments with the cultivars Beli izvor, Ogosta, Chirpan 603, Chirpan 539 and Avanguard. The trial was carried out in 6 variants with 3 replications. These concentrations of heavy metals were - 0,1.5,2.5,3.5,5 and 10 times above the maximum permissible concentrations.
The results showed that, heavy metals' concentrations in the soil, that were higher than 5 times above the maximum permissible concentrations, were lethal to some cotton cultivars. The main part of the absorbed quantities of heavy metals were fixed and accumulated in the root system of the cotton plants. In concentrations of Cu, Zn, Cd and Pb in the soil up to 3.5 times above the maximum permissible concentrations, the Bulgarian cotton cultivars did not exhibit tendency towards accumulation of high quantities of heavy metals in the fibre and the seeds.

Key words: accumulation, cotton, cultivars, concentrations of heavy

metals