TY  - JOUR
AU  - Kasteel, R.
AU  - Pütz, T.
AU  - Vanderborght, J.
AU  - Vereecken, H.
TI  - Fate of two herbicides in zero-potential lysimeters and in field soil
JO  - Journal of environmental quality
VL  - 39
SN  - 0047-2425
CY  - Madison, Wis.
PB  - ASA [u.a.]
M1  - PreJuSER-11425
SP  - 1451 - 1466
PY  - 2010
N1  - Record converted from VDB: 12.11.2012
AB  - In Germany, zero-tension lysimeters are used as parr of the registration requirements in case pesticides pose a potential threat to conrtaminate the groundwater However, the water regime and the method of pesticide sampling differ between the lysimeters and the field We monitored the transport of the two herbicides ethidimuron [1-(5- erhylsulfonyl-1,3,4-thiadiazol-1-2-yl)-1,3-dimethylurea] (ETD) and methabenzthiazuron [1-benzothiazol-2-yl-1,3-dimethyl-urea] (MBT) and their main metabolite, accompanied with bromide as conservative tracer, in zero-tension lysimeters filled with undisturbed soil and in the field The herbicides were applied as a short pulse to the bare soil surface Herbicide concentrations were analyzed in the drainage water of the 1 2-m-deep lysimeters and from soil cores taken from the field during six campaigns Soil coring in the field emphasized matrix flow and allowed us to estimate the field-based dissipation and sorption parameters Based on mass recovery calculations, the field fine was 870 d for ETD compared with 389 d for its main metabolite The initially fast field-based dissipation of MBT with a half-life value of approximately 1 mo was followed by a much slower dissipation The retardation factor was estimated from the concentration profiles by Inversely solving the convection dispersion equation and yielded 18 2 +/- 1.3 for ETD and 36 9 +/- 17 5 for MBT For the lysimeters, a leaching period of 2 1/2 yr was too short to monitor bulk herbicide mass through the sod matrix Only 1.7% of the applied EDT and 1 4% of the applied MBT were sampled in the drainage water at 1.2 m depth. Despite contrasting sorption and dissipation properties. both herbicides appeared fast and at the same time in the drainage water, hinting at preferential flow phenomena. Compared with field fare of herbicides measured by soil coring, zero-potential lysimeters emphasize the transport of small amounts of herbicides triggered by preferential flow events.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000279514200034
DO  - DOI:10.2134/jeq2009.0236
UR  - https://juser.fz-juelich.de/record/11425
ER  -