Phytoremediation of soil contaminated with ALS and PS II inhibitors herbicides

Abstract

Alternative to decontaminate the soil is the phytoremediation practice. In this way, this study aimed to evaluate the phytoremediation potential of the following species: vetch, radish, cereal rye, black soybean and colonião grass, grown in a soil contaminated with atrazine and chlorimuron ethyl + sulfometuron-methyl. The herbicides were applied in pre-emergence of the species. Two experiments were installed, the first one tested the phytoremediation potential of the species and the second one used the cucumber as bioindicator culture to prove if the soil had been depolluted. The variables evaluated at 40 days after emergence (DAE) were: phytotoxicity (%), height (cm) and dry mass of the aerial part of the plants (g). There is a great variation in the selectivity of the cultures to the two herbicides, and the chlorimuron-ethyl + sulfometuron-methyl mixture presented the highest phytotoxicity symptoms, both for the phytoremediation species and for the bioindicator culture. The results allowed to conclude that the management the black soybean presented a greater potential of phytoremediation of soil contaminated with chlorimuron-ethyl + sulfometuron-methyl and that the colonium grass was the species that demonstrated satisfactory potential as phytoremediation plant of contaminated soil with atrazine.