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| Web URL(s): | https://dl.sciencesocieties.org/publications/jeq/pdfs/30/4/1360
Last checked: 12/14/2016
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https://dl.sciencesocieties.org/publications/jeq/articles/30/4/1360
Last checked: 12/14/2016
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Roy, J. W.;
Hall, J. C.;
Parkin, G. W.;
Wagner-Riddle, C.;
Clegg, B. S. |
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| Author Affiliation: | Roy, Parkin, and Wagner-Riddle: Department of Land Resource Science; Hall and Clegg: Department of Envoirnmental Biology, University of Gueplph, Guelph, ON, Canada |
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| Title: | Seasonal leaching and biodegradation of dicamba in turfgrass |
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| Source: | Journal of Environmental Quality. Vol. 30, No. 4, July/August 2001, p. 1360-1370. |
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| Publishing Information: | Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Leaching; Seasons; Biodegradation; Dicamba; Herbicides; Groundwater contamination; Soil temperature; Soil water content; Infiltration; Thatch; Transport (chemical); Models; Poa pratensis
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| Abstract/Contents: | "The leaching of surface-applied herbicides, such as dicamba (2-methoxy-3,6-dichlorobenzoic acid), to ground water is an environmental concern, Seasonal changes in soil temperature and water content, affecting infiltration and biodegradation, may control leaching. The objectives of this study were to (i) investigate the leaching of dicamba applied to turfgrass, (ii) measure the degradation rate of dicamba in soil and thatch in the laboratory under simulated field conditions, and (iii) test the ability to the model EXPRES (containing LEACHM) to simulate the field transport and degradation processes. Four field lysimeters, packed with sandy loam soil and topped with Kentucky bluegrass(Poa pratensis L.) sod, were monitored after receiving three applications (May, September, November) of dicamba. Concentrations of dicamba greater than 1 mg L-1 were detected in soil water. Although drying of the soil during the summer prevented deep transport, greater leaching occurred in late autumn due to increased infiltration. From the batch experiment, the degradation rate for dicamba in thatch was 5.9 to 8.4 times greater than for soil, with a calculated half-life as low as 5.5 d. Computer modeling indicated that the soil and climatic conditions would influence the effectiveness of greater degradation in thatch for reducing dicamba leaching. In general, EXPRES predictions were similar to observed concentration profiles, though peak dicamba concentrations at the 10-cm depth tended to be higher than predicted in May and November. Difference, between predictions and observations are probably a result of minor inaccuracies in the water-flow simulation and the model's inability to modify degradation rates with changing climatic conditions." |
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| Language: | English |
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| References: | 49 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Roy, J. W., J. C. Hall, G. W. Parkin, C. Wagner-Riddle, and B. S. Clegg. 2001. Seasonal leaching and biodegradation of dicamba in turfgrass. J. Environ. Qual. 30(4):p. 1360-1370. |
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| Web URL(s):
https://dl.sciencesocieties.org/publications/jeq/pdfs/30/4/1360
Last checked: 12/14/2016
Requires: PDF Reader
Access conditions: Item is within a limited-access website
https://dl.sciencesocieties.org/publications/jeq/articles/30/4/1360
Last checked: 12/14/2016
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: S 900 .J6 |
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