Pendimethalin Dissipation in Kentucky Bluegrass Turf

Pendimethalin dissipation was studied following annual 1.7 kg ai ha–1 applications to 3-yr-old Kentucky bluegrass turf growing on a Sharpsburg silty clay loam soil and an 85/15 by volume sand/Sharpsburg soil mixture in 150-cm-deep rhizotron containers. Plant tissue, thatch, and soil were sampled per...

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Bibliographic Details
Published in:Weed science 1991-01, Vol.39 (1), p.97-103
Main Authors: Stahnke, G. K., Shea, P. J., Tupy, D. R., Stougaard, R. N., Shearman, R. C.
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
AGUAS SUBTERRANEAS
Biological and medical sciences
CANA
CESPED
CHAUME
Chemical control
Clay loam soils
CONTROL QUIMICO
DESHERBAGE
EAU SOUTERRAINE
ESCARDA
Fundamental and applied biological sciences. Psychology
GAZON
Herbicides
LESSIVAGE DU SOL
LIXIVIACION
LUTTE CHIMIQUE
METABOLISME
METABOLISMO
METABOLITE
METABOLITOS
Parasitic plants. Weeds
PENDIMETALINA
PENDIMETHALINE
Phytopathology. Animal pests. Plant and forest protection
POA PRATENSIS
POLLUTION DE L'EAU
POLUCION DEL AGUA
PROCESOS DE TRANSPORTE EN EL SUELO
Rain
Silt loam soils
Soil depth
Soil pollution
Soil samples
Soil water
Soil, Air and Water
Soll, Air, and Water
Thatch
TRANSPORT DANS LE SOL
Turf grasses
Weeds
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Summary:Pendimethalin dissipation was studied following annual 1.7 kg ai ha–1 applications to 3-yr-old Kentucky bluegrass turf growing on a Sharpsburg silty clay loam soil and an 85/15 by volume sand/Sharpsburg soil mixture in 150-cm-deep rhizotron containers. Plant tissue, thatch, and soil were sampled periodically between application and 168 days after treatment (DAT). Soil and leachate were collected to monitor pendimethalin movement. Most of the herbicide appeared to remain within the turfgrass system. Pendimethalin concentration was highest in plant tissue and thatch. The 4-hydroxymethyl pendimethalin metabolite was detected in turfgrass tissue up to 42 DAT. No pendimethalin was detected at the 30-, 60-, or 120-cm depths in the rhizotron containers. Traces (≤0.003 mg kg–1) of pendimethalin detected in rhizotron leachate collected between 6 and 14 days after heavy rainfall (88 and 95 DAT, respectively) were attributed to gravitational displacement of soil colloids containing adsorbed herbicide. Pendimethalin application to established turfgrass would not appear to pose a high risk of groundwater contamination.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500057945