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| Web URL(s): | http://crops.confex.com/crops/2005am/techprogram/P6316.HTM
Last checked: 02/02/2006 |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Hixson, Adam;
Weber, Jerome;
Shi, Wei;
Yelverton, Fred;
Rufty, Thomas |
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| Author Affiliation: | North Carolina State University |
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| Title: | Role of organic matter in the degradation of 14C-simazine in soils from turfgrass systems |
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| Section: | Graduate student oral competition: Breeding, fertility, environment, and management
Other records with the "Graduate student oral competition: Breeding, fertility, environment, and management" Section
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| Meeting Info.: | Salt Lake City, UT: 7-10 November, 2005 |
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| Source: | 2005 Annual Meeting Abstracts [ASA/CSSA/SSSA/CSSS]. 2005, p. [1]. |
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| Publishing Information: | [Madison, WI]: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Organic matter; Simazine; Carbon-14; Groundwater contamination; Pesticide fate; Pesticide degradation; Binding; Leaching; Biodegradation
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| Abstract/Contents: | "Considerable concern exists about pesticide losses and contamination of ground water with intensely managed turfgrass systems. Triazine herbicides such as simazine are subject to high mobility in the sandy soils commonly found beneath golf course fairways in coastal regions of the southeastern U.S. In these experiments, we investigate the influence of organic matter binding on degradation of 14C-simazine [6-chloro-N,N'-diethyl-1,3,5-triazine-2,4-diamine] in soils from turfgrass systems of widely varying ages that have differing levels of organic matter. Simazine additions to sterile soil revealed substantial potential for binding to organic matter. Binding capacity was related to organic matter content, with 58, 83 and 78% of applied 14C bound in soils from 5, 21 and 95 yr old turfgrass systems after 16 weeks of incubation. When non-sterile soil with high biological activity was examined, significant organic matter binding still was present. Release of 14CO2, presumably resulting from biological degradation and cleavage of the triazine ring, was the primary fate of simazine, as 73, 77 and 54% was released from the three types of soils. Bound simazine still accounted for 17, 19, and 31% of applied 14C even after 16 weeks of incubation. Furthermore, 14C binding was evident to a greater soil depth with the older turfgrass systems. These results indicate that organic matter and simazine interactions are an important determinant of simazine leaching potential. As turfgrass systems age and organic matter levels increase, the potential for simazine leaching into groundwater decreases even though biological degradation rates may be lower." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Weber, J., F. Yelverton, T. Rufty, A. Hixson, and W. Shi. 2005. Role of organic matter in the degradation of 14C-simazine in soils from turfgrass systems. Annu. Meet. Abstr. p. [1]. |
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Last checked: 02/02/2006 |
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