AGROECOLOGICAL ASSESSMENT OF HEAVY METALS AND ARSENIC CONTENT IN CHERNOZEM IN THE COMMON CENTRAL BLACK EARTH REGION OF RUSSIA

Abstract

Agroecological assessment of the content of Mn, Zn, Ni, Cr, Cu, Pb, Co, As, Cd, Hg in the chernozems of common light-clay was carried out in the steppe zone of the Central Black Earth Region. As a result of studies, it was found that the content of the studied elements in virgin black soil was within the range of varying their concentrations in arable analogues or even lower. Only the gross content of Mn in virgin soil was above the upper limit of variation in the content of this element in arable soils. By average gross content in arable chernozems, common elements form the following descending series (mg/kg) Mn (397) Zn (42.9) Ni (33.1) Cr (23.7) Cu (15.8) Pb (11.2) Co (9.51) As (5.48) Cd (0.35) Hg (0.023), and in terms of the average content of mobile forms, the dependence is slightly different: Mn (4.14) Pb (0.75) Ni (0.59) Zn (0.36) Cr (0.31) Cu (0.1) Co (0.09) Cd (0.04) There was no excess of the established UEC and MAC standards for the studied elements in the studied soils, therefore there is no danger to obtain environmentally safe crop production. There was no excess of the established UEC and MAC standards for the studied elements in the studied soils, therefore there is no danger to obtain environmentally safe crop production. The content of mobile forms Mn, Zn, Cu, Co corresponds to a low level of availability, therefore, these elements must be introduced into agrocenoses with micro-fertilizers to increase the yield and quality of agricultural products.