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. Failure to comply with the rules and regulations in the pesticides application can lead to environmental pollution, in particular, soil and groundwater occupy the first place by pollution level. The purpose of the study – was to assess the potential ecotoxicological hazards of Stratos Ultra herbicide and its active substance cycloxydim, the risk of contamination of surface and groundwater by cycloxydim. Materials and methods of research. An estimation of the environmental hazard of Stratos Ultra herbicide has been carried out on the basis of ecotoxicological hazard assessment (ecotox), integral hazard vector (R), groundwater ubiquity score (GUS), leaching potential (LEACH) indices. Results. It was established that in the soil and climatic conditions of Ukraine the ecotoxicological risk of Stratos Ultra herbicide on cycloxydim basis application is 7,23×10-5, the persistence index is – 0,22 week, the GUS index is 2,01, the LEACH index – 7,19 and the integral vector (R) is 94 points. Conclusions. It was shown that when applying the herbicide Stratos Ultra, the ecotoxicological risk of cyclooxydim is 5 orders of magnitude lower than that of DDT. According to the index of groundwater ubiquity score (GUS) the substance is classified as an average hazardous, by the integral vector (R) and the LEACH index corresponds to a high level of ground and surface water pollution risk, according to the persistence index – a low level of soil contamination by the studied herbicide.

EVALUATION OF POTENTIAL ECOTOXICOLOGICAL RISK OF HERBICIDE STRUCTURE OF ULTRA AND ITS EXISTING SUBSTANCE OF CYCLOXIDIS