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| Web URL(s): | http://usgatero.msu.edu/v02/n05.pdf
Last checked: 04/2003
Requires: PDF Reader |
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| Publication Type:
| Report |
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| Author(s): | Carroll, Mark;
Hill, Robert L. |
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| Title: | Does thatch complicate pesticide leachate predictions? |
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| Source: | USGA Turfgrass and Environmental Research Online. Vol. 2, No. 5, March 1 2003, p. [1-11]. |
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| Publishing Information: | Far Hills, NJ: United States Golf Association, Green Section |
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| # of Pages: | 11 |
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| Keywords: | TIC Keywords: Water quality; Sorption; Agrostis stolonifera; Zoysia Japonica; Leaching; Carbaryl; Pesticides; 2,4-D; Mobility; Thatch; Models
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| Abstract/Contents: | "Simulation models used in golf course water quality risk assessment often times assume instantaneous pesticide sorption. Since pesticides must pass through an organic-rich turfgrass thatch layer, this assumption may not be appropriate for modeling the transport of some pesticides. Studies were conducted to examine the sorption behavior of 2,4-D and carbaryl to creeping bentgrass (Agrostis stolonifera) and zoysiagrass (Zoysia japonica) thatch and to determine the influence of thatch on 2,4-D leaching from columns with a thatch layer and from columns devoid of thatch. Leachate data were used to evaluate the performance of equilibrium (i.e. instantaneous sorption), one-site non-equilibrium (i.e. kinetic sorption) and two-site non-equilibrium (i.e. kinetic and instantaneous sorption) models to predict 2,4-D transport. Pesticide mobility often depends on the initial sorptive behavior of a pesticide. Carbaryl reached apparent sorption equilibrium rapidly while sorption of 2,4-D to thatch was highly dependent on solution resident times. Bentgrass thatch was more effective in reducing 2,4-D leaching than was zoysiagrass thatch. The sorptive behavior of a pesticide to thatch can be markedly different from that of the underlying soil. The two-site non-equilibrium model provided more accurate predictions of 2,4-D leaching than when instantaneous equilibrium sorption or one-site kinetic non-equilibrium sorption was assumed. The use of non-equilibrium models should be considered for evaluating `worst-case' turfgrass pesticide leaching loss scenario's. Thatch may complicate model predictions of pesticide transport and care should be used in choosing the appropriate model for pesticide transport predictions. Studies examining the size of organic constituents and the state of decomposition of the decaying plant material within thatch are needed to better understand turfgrass species' differences in pesticide leaching." |
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| Language: | English |
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| References: | 8 |
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| See Also: | Other items relating to: 2, 4 - D in Turf |
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| See Also: | Other Reports from this USGA research project: 1995-03-083; 1998-39-147 |
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| Note: | Pictures, color
Tables
Graphs
Summary as abstract |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Carroll, M., and R. L. Hill. 2003. Does thatch complicate pesticide leachate predictions?. USGA Turfgrass Environ. Res. Online. 2(5):p. [1-11]. |
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| Web URL(s):
http://usgatero.msu.edu/v02/n05.pdf
Last checked: 04/2003
Requires: PDF Reader |
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MSU catalog number: SB 433 .A1 A65 [online] |
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