Release of non-extractable or bound residues of the atrazine herbicide in soil and its absorption by plants

Among the pesticide residues in soil, the non-extractable or bound residues may be formed resulting in less bioavailability and less leaching of the p esticide residues. From the environmental point of view the knowledge on th e possibility of the biorelease of these residues is needed for evaluations on long term pollution. The release of C-14-atrazine bound residues was in vestigated in soil by addition of inocula with microorganisms and the possi bility of their absorption by plants through radiometric techniques. The (C O2)-C-14 production almost did not happen (only from 0% to 0.8%) and additi onal release of extractable residue from bound residues of C-14-atrazine wa s small (until 3.5%). The bioreleased values were near the same in steriliz ed or with inocula of microorganisms soil samples. The uptake of bound resi dues was not observed neither by rice or bean plants.