THE EFFECT OF PLANT GROWTH-PROMOTING RHIZOBACTERIA ON MOBILITY OF TOXIC ELEMENTS FROM PHOSPHOGYPSUM AND IMPLICATION ON HUMAN EXPOSURE

This study investigated the effects of a plant growth-promoting rhizobacteria on soil treated with phosphogypsum (PG) as the mineral additive. The indigenous bacterial strain was isolated from PG polluted soil and identified as Bacillus megaterium, which is able to stimulate plant growth under heavy metals stress conditions. There were nine treated soils with three replicates: 1. control (without PG and inoculums (I) application); 2. control with inoculums (without PG application); 3. (9) PG application (1%, 2%, 3%, 4%, 6%, 8% and 10%) equivalent to 10 t ha^sup -1^ - 220 t ha^sup -1^. The objectives of this study consisted on monitoring the heavy metals levels (Cu, Fe, Zn, Mn) in the body of soybean (Glycine max) and evaluation of the human health risk. This work demonstrates, that PG-BM30 coupling effect in the soil on seed germination, seedling growth, biomass accumulation and heavy metals bioaccumulation do not exhibit risk to human health.