PT Journal
AU Schuhmann, A
   Klammler, G
   Weiss, S
   Gans, O
   Fank, J
   Haberhauer, G
   Gerzabek, HM
TI Degradation and leaching of bentazone, terbuthylazine and S-metolachlor and some of their metabolites: A long-term lysimeter experiment
SO Plant, Soil and Environment
PY 2019
BP 273
EP 281
VL 65
IS 5
DI 10.17221/803/2018-PSE
DE agriculture; herbicide; contamination; metabolism
AB 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 ug/L, whereas metolachlor-ESA and metolachlor-OA were present at higher concentrations of up to 37 ug/L and 8.4 ug/L, respectively. In a second terbuthylazine application, concentrations of desethyl-terbuthylazine of up to 0.1 ug/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.
ER