Heavy metals in the "soil-plant" system when using sewage sludge

Abstract

This article presents the results of studies of the content of chemical elements in the "soil-plant" system when various doses of sewage sludge are introduced into the soil. The degree of soil contamination with heavy metals was assessed, chemical concentration coefficients were calculated, the soils were classified by permissible pollution, with the possibility of use for any agricultural crops, and theoretical calculations of the maximum possible one-time dose of sewage sludge to the soil according to the limiting indicator of the concentration of heavy metals were given. The concentration of heavy metals in the carrot and table beet biomass has been studied. It was found that the use of sewage sludge as fertilizer affected the content of dry matter, ash and chemical elements in carrot, the dynamics of migration of heavy metals into plant biomass correlates with an increase in their concentration in the soil, and the accumulation of chemical elements in the photosynthetic part is more intense.