Atrazine dissipation and off-plot movement in a Nebraska sandhills subirrigated meadow

Atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine] can be used to modify species composition of naturally subirrigated Sandhills meadows. The potential for ground water contamination exists as the water table depth ranges from 0 to 3 m. Atrazine was applied at 2.2 and 3.4 kg h...

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Bibliographic Details
Published in:Journal of range management 1988-09, Vol.41 (5), p.416-420
Main Authors: Brejda, J.J, Shea, P.J, Moser, L.E, Waller, S.S
Format: Article
Language:English
Subjects:
Agricultural soils
AGUAS SUBTERRANEAS
Coarse textured soils
CONTAMINACION DEL AGUA
EAU DE RUISSELLEMENT
EAU SOUTERRAINE
ESCORRENTIA
EXPLOITATION DES HERBAGES
GRASSLAND MANAGEMENT
GROUNDWATER
HERBICIDAS
HERBICIDE
HERBICIDES
Improvements
MANEJO DE PRADERAS
Meadows
NEBRASKA
POLLUTION DE L'EAU
PROPIEDADES FISICO-QUIMICAS (SUELO)
PROPRIETE PHYSICO-CHIMIQUE DU SOL
RESIDU
RESIDUES
RESIDUOS
RUNOFF
Sedimentary soils
SOIL CHEMICOPHYSICAL PROPERTIES
Soil depth
Soil organic matter
Soil pollution
Soil samples
Soil water
VEGETACION
VEGETATION
WATER POLLUTION
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Summary:Atrazine [6-chloro-N-ethyl-N′-(1-methylethyl)-1,3,5-triazine-2,4-diamine] can be used to modify species composition of naturally subirrigated Sandhills meadows. The potential for ground water contamination exists as the water table depth ranges from 0 to 3 m. Atrazine was applied at 2.2 and 3.4 kg ha-1in May 1984, August 1984, or May 1985 to a Gannett fine sandy loam (Typic Haplaquoll, coarse-loamy, mixed, mesic) in a Nebraska Sandhills subirrigated meadow. Residues of atrazine applied in 1984 and 1985 carried over into 1985 and 1986, respectively. Herbicide dissipation and off-plot movement were monitored in 1985 by sampling soil at 0 to 5 cm and 5 to 15 cm depths within and outside the experimental areas. Atrazine dissipation initially approached zero-order kinetics after May 1985 application, but generally followed first-order kinetics during the entire 320-day sampling period. Atrazine half-life in the entire 0 to 15 cm sampling zone was 46 ± 7 days. Herbicide concentrations at the 5 to 15 cm sampling depth did not exceed levels measured at 5 days after application. Low and highly variable atrazine concentrations detected in some of the untreated plots and in some off-plot soil samples indicated minimal lateral movement of the herbicide.
ISSN:0022-409X
2162-2728
DOI:10.2307/3899581