Biological accumulation of zinc and copper in the «Soil-plant» system in the conditions of the south of Western Siberia

Abstract

The purpose of the work was to study the intensity of biological accumulation of zinc and copper Tanacetum vulgare in the conditions of Western Siberia. Field experiments were carried out in the period 2012-2015 on meadow-chernozem soil of the southern forest-steppe of the Omsk region. The medicinal crop Tanacetum vulgare was chosen as an object of research. Copper and zinc fertilizers in acetate forms were applied in the background (N135P45K45). The content of mobile forms of Zn and Cu in soil and plant samples was determined by atomic absorption method. When zinc and copper fertilizers were applied, the content of mobile forms of Zn and Cu in the soil increased compared with the control and the ground. At the same time, application of micronutrient fertilizers did not lead to excess of MAC. The content of zinc in medicinal raw material Tanacetum vulgare changed from 25.3 to 48.0 mg/kg; of copper from 4.3 to 8.3 mg/kg after application of micronutrient fertilizers. The content of trace elements in medicinal raw material Tanacetum vulgare did not exceed MAL (Cu-30 mg/kg, Zn-50 mg/kg). To estimate the intensity of absorption of trace elements Tanacetum vulgare used coefficients of biological accumulation (Cba Zn, Cu). According to values of coefficients of biological accumulation, Tanacetum vulgare intensively absorbed zinc (Cba = 4, 59-16, 8) and very intensively and intensively copper (Cba = 23, 33-48, 82). Thus, the studies showed that this crop is a copper concentrator, as Cba Cu > Cba Zn.