Schuhmann Andrea author Klammler Gernot author Weiss Stefan author Gans Oliver author Fank Johann author Haberhauer Georg author Gerzabek Martin H. author text journal article 2019 The degradation and leaching of bentazone, terbuthylazine and S-metolachlor and their metabolites N-methyl-bentazone, desethyl-terbuthylazine, 2-hydroxy-terbuthylazine, metolachlor ethane sulfonic acid (ESA) and metolachlor oxanilic acid (OA) were investigated using the plant protection products Artett (bentazone/terbuthylazine), Gardo Gold (S-metolachlor/terbuthylazine) and Dual Gold (S-metolachlor) applied to a weighable, monolithic, high precision lysimeter with a loamy, sandy soil. Artett and Gardo Gold were applied at higher doses than recommended according to good agricultural practice. In leachate, S-metolachlor was detected at concentrations of up to 0.15 µg/L, whereas metolachlor-ESA and metolachlor-OA were present at higher concentrations of up to 37 µg/L and 8.4 µg/L, respectively. In a second terbuthylazine application, concentrations of desethyl-terbuthylazine of up to 0.1 µg/L were detected. In soil, bentazone degraded faster than terbuthylazine and S-metolachlor, whereas the metabolization of terbuthylazine after the second application resulted in an enhanced formation of desethyl-terbuthylazine and a highly increased hydroxylation of terbuthylazine. The importance of analysing both parent compounds and metabolites on a long-term scale was demonstrated to better understand the environmental fate and transport. agriculture; herbicide; contamination; metabolism 10.17221/803/2018-PSE https://pse.agriculturejournals.cz/artkey/pse-201905-0008.php https://pse.agriculturejournals.cz/artkey/pse-201905-0008.php continuing 65 5 273 281 2019 12141178 periodical academic journal