Effect of bean perennial plants growing on soil heavy metal concentrations

Abstract

The results of researching the effectiveness of growing legumes perennial plants as natural constraints of heavy metals in the soil, in particular lead, cadmium, copper and zinc, as well as the change in the concentration of heavy metals in the soil and the total index of soil contamination by heavy metals have been presented. It was ascertained that during the two-year growth of legumes perennial plants in the soil decreased the concentration of lead by 3.4-74.6%, cadmium - by 16.7-96.7%, copper - by 1.5-11.8%, zinc - by 27.5-69.2%. The highest efficiency of reducing the concentration of lead, cadmium, copper and zinc in the soil was observed because of growing O nobrychis arenaria . During the four-year-long growth of legumes, perennial plants in the soil a decrease in lead concentration has been revealed by 39.0–74.6%, cadmium - by 96.7–98.3%, copper - by 94.1–98.5%, zinc by 73.6–90.1%. The highest efficiency of reducing the concentration of lead in the soil was observed while cultivating O nobrychis arenaria , cadmium, copper and zinc - A lfalfa lucerne , O nobrychis arenaria , Lotus corniculatus and galega oritntalis.