BIOREMEDIATION OF AGRICULTURAL SOIL CONTAMINATED WITH LEAD USING INTERACTION COMMON BARLEY HORDEUM VULGARE AND EARTHWORM LUMBRICUS SP
The aim of this work is to study the possibility of remedying polluted agricultural soils by lead with the association: earthworms barley. An experimentation of sixty pots was conducted in controlled conditions containing artificially contaminated soil by lead. It is divided into three systems: S1: soil plant; S2: soilearthworms; S3: soil plant earthworms, and five blocks representing lead concentrations: control; 500 mg g; 1000 mg g; 1500 mg gand 2000 mg g with 4 replicas each. The results show that the S3 system (soil plant earthworm) has the highest remediation rate compared to the two other: S1 (soil earthworm) S2 (soil plant) The presence of earthworms Lumbricus sp decreases the bioaccumulation of lead by Hordeum vulgare, while concentrations recorded in earthworm tissues suggests that the presence of the plant considerably increase those concentrations. The concentrations of lead in soil, earthworms and plants are influenced by the physical and chemical soil parameters; however, other factors related to the pollutant, the species of both earthworm and plant and their interactions can increase or decrease retention of lead by the soil and its bioaccumulation.