The environmental fate of diuron under a conventional production regime in a sugarcane farm during the plant cane phase

Stork, Peter R., Bennett, Frederick R. and Bell, Michael J. (2008) The environmental fate of diuron under a conventional production regime in a sugarcane farm during the plant cane phase. Pest Management Science, 64 9: 954-963. doi:10.1002/ps.1593


Author Stork, Peter R.
Bennett, Frederick R.
Bell, Michael J.
Title The environmental fate of diuron under a conventional production regime in a sugarcane farm during the plant cane phase
Journal name Pest Management Science   Check publisher's open access policy
ISSN 1526-498X
1526-4998
Publication date 2008-09
Sub-type Article (original research)
DOI 10.1002/ps.1593
Volume 64
Issue 9
Start page 954
End page 963
Total pages 10
Place of publication London, United Kingdom
Publisher John Wiley & Sons
Language eng
Formatted abstract
BACKGROUND: Field studies of diuron and its metabolites 3-(3,4-dichlorophenyl)-1-methylurea (DCPMU), 3,4-dichlorophenylurea (DCPU) and 3,4-dichloroaniline (DCA) were conducted in a farm soil and in stream sediments in coastal Queensland, Australia.
RESULTS: During a 38 week period after a 1.6 kg ha−1 diuron application, 70–100% of detected compounds were within 0–15 cm of the farm soil, and 3–10% reached the 30–45 cm depth. First-order t1/2 degradation averaged 49 ± 0.9 days for the 0–15, 0–30 and 0–45 cm soil depths. Farm runoff was collected in the first 13–50 min of episodes lasting 55–90 min. Average concentrations of diuron, DCPU and DCPMU in runoff were 93, 30 and 83–825 µg L−1 respectively. Their total loading in all runoff was > 0.6% of applied diuron. Diuron and DCPMU concentrations in stream sediments were between 3–22 and 4–31 µg kg−1 soil respectively. The DCPMU/diuron sediment ratio was > 1.
CONCLUSION: Retention of diuron and its metabolites in farm topsoil indicated their negligible potential for groundwater contamination. Minimal amounts of diuron and DCMPU escaped in farm runoff. This may entail a significant loading into the wider environment at annual amounts of application. The concentrations and ratio of diuron and DCPMU in stream sediments indicated that they had prolonged residence times and potential for accumulation in sediments. The higher ecotoxicity of DCPMU compared with diuron and the combined presence of both compounds in stream sediments suggest that together they would have a greater impact on sensitive aquatic species than as currently apportioned by assessments that are based upon diuron alone.
Keyword Diuron
Leaching
Dissipation
Degradation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Alliance for Agriculture and Food Innovation
 
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Created: Mon, 07 Mar 2011, 14:35:23 EST