The ways to increase the efficiency of degradation of pesticides of sulphonylurea group by microorganisms-destructors

Abstract

The most important component of destruction of herbicides in soil is their degradation by soil microbiota, which occurs due to the capability of microorganisms to adapt their enzymatic systems to specific substrates and to transform them. Bioaugmentation is one of the most ecological and economical methods of remediation of natural objects. However, the use of this way provides the need to receive a comprehensive information about migration, cumulation and transformations of pesticides in the environment (about dynamics) and also about factors, which increase the efficiency of focused application of bacteria-destructors (immobilization, introduction of additional substrates). This research is focused on the study of the influence of different factors on the efficiency of degradation of pesticides of sulphonylurea group in soil. The results show that intensification of process of degradation of remaining amounts of tribenuron-methyl and metsulfuron-methyl in soil and liquid medium can be achieved by the exposure of bacteria-destructors to optimal conditions during cultivation as well as by the use of immobilized cells of microorganisms.