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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=203
Last checked: 07/18/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Hixson, A. C.;
Weber, J. B.;
Shi, W.;
Yelverton, F. H.;
Rufty, T. W. |
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| Author Affiliation: | North Carolina State University, Raleigh, NC |
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| Title: | Adsorption and degradation of 14C-simazine in soils from two depths in aged turfgrass systems |
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| Section: | Weed management in turf grass
Other records with the "Weed management in turf grass" Section
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| Meeting Info.: | San Antonio, Texas: January 23-25, 2006 |
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| Source: | Proceedings: Southern Weed Science Society 59th Annual Meeting. Vol. 59, 2006, p. 130. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Adsorption; Chemical soil analysis; Degradation; Herbicide evaluation; Herbicide fate; Old greens versus young greens; Soil depth
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| Trade Names: | C-Simazine |
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| Abstract/Contents: | "Soil adsorption and degradation of 14C-simazine [6-chloro-N,N'-diethyl-1,3,5-triazine-2,4-diamine] in soils from aged turfgrass systems was monitored for 4 months, using sterile and nonsterile soil microcosms. Triazine herbicides such as simazine are subject to higher mobility in alkaline, sandy soils commonly associated with coastal golf course fairways. These experiments investigate mechanisms of pesticide fate in turfgrass soils with increasing levels of organic matter, and answers to concern of pesticide groundwater contamination in turfgrass areas. Soils from coastal turfgrass systems of three different ages and adjacent native pine areas were sampled by intact coring techniques. A factorial design with soil treatments (sterile and non-sterile), soil depths (0-5 and 5-15 cm), and turfgrass system ages (5, 21, and 95 years) as variables was employed. Simazine biological degradation estimated by 14CO2 evolution was similar at both depths only in the oldest turfgrass system. 14CO2 evolution decreased with increasing soil depth in the two younger soil systems. After 16 weeks, bound residues accounted for 21, 15, and 23% of the applied radioactivity in non-sterile surface soil from the 5, 21, and 95-year-old turfgrass systems, respectively. In addition, 73 (5 yrs.), 77 (21 yrs.), and 54% (95 yrs.) was recovered as 14CO2, indicating significant cleavage of the triazine ring. Bound residues increased to 42% of the applied radioactivity in the subsoil of the 95-year-old soil, but remained similar for the other two soil systems. In the absence of biological degradation, simazine became primarily adsorbed to soil particles the older two systems with 45 (21 yrs.) and 63% (95 yrs.) of the applied simazine recovered in the bound fraction after 16 weeks of incubation. Little 14CO2 (< 12%) evolved from any soil from adjacent pine areas during the 16-week incubation period. Simazine biologically degraded slower and adsorbed more to the surface soil with increasing turfgrass system age. Conversely, simazine biologically degraded more readily in younger turfgrass systems with less adsorption to soil particles. As turfgrass systems age and organic matter levels increase, potential for simazine leaching into groundwater decreases." |
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| Language: | English |
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| References: | 0 |
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| Note: | "Vision for the future"
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hixson, A. C., J. B. Weber, W. Shi, F. H. Yelverton, and T. W. Rufty. 2006. Adsorption and degradation of 14C-simazine in soils from two depths in aged turfgrass systems. South. Weed Sci. Soc. Proc. 59:p. 130. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2006 Proceedings-SWSS.pdf#page=203
Last checked: 07/18/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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