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| DOI: | 10.1002/ps.738 |
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| Web URL(s): | http://onlinelibrary.wiley.com/doi/10.1002/ps.738/full
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| Publication Type:
| Refereed |
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| Author(s): | Malone, Robert W.;
Ma, Liwang;
Wauchope, R. Don;
Ahuja, Lajpat R.;
Rojas, Kenneth W.;
Ma, Qingli;
Warner, Richard;
Byers, Matt |
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| Author Affiliation: | Malone: USDA-Agricultural Research Service, National Soil Tilth Laboratory, Ames, Iowa; L. Ma, Ahuja, and Rojas: USDA-Agricultural Research Service, Great Plains Systems Research, Fort Collins, Colorado; Wauchope: USDA-Agricultural Research Service, Southeast Watershed Research Laboratory, Tifton, Georgia; Q. Ma: Environmental and Turf Services, Inc., Wheaton, Maryland; Warner: Department of Biosystems and Agricultural Engineering, University of Kentucky, Lexington, Kentucky; and Byers: Zoeller Company, Louisville, Kentucky |
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| Title: | Modeling hydrology, metribuzin degradation and matribuzin transport in macroporous tilled and no-till silt loam soil using RZWQM |
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| Source: | Pest Management Science. Vol. 60, No. 3, March 2004, p. 253-266. |
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| Publishing Information: | London: for the Society of Chemical Industry by John Wiley & Sons |
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| # of Pages: | 14 |
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| Related Web URL: | http://onlinelibrary.wiley.com/doi/10.1002/ps.738/abstract
Last checked: 02/28/2014
Notes: Abstract only |
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| Keywords: | TIC Keywords: Macropores; Metribuzin; Models; Pesticide degradation; Pesticide evaluation; Root zone; Soil absorption; Water quality
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| Abstract/Contents: | "Due to the complex nature of pesticide transport, process-based models can be difficult to use. For example, pesticide transport can be effected [affected] by macropore flow, and can be further complicated by sorption, desorption and degradation occurring at different rates in different soil compartments. We have used the Root Zone Water Quality Model (RZWQM) to investigate these phenomena with field data that included two management conditions (till and no-till) and metribuzin concentrations in percolate, runoff and soil. Metribuzin degradation and transport were simulated using three pesticide sorption models available in RZWQM: (a) instantaneous equilibrium-only (EO); (b) equilibrium-kinetic (EK, includes sites with slow desorption and no degradation); (c) equilibrium-bound (EB, includes irreversibly bound sites with relatively slow degradation). Site-specific RZWQM input included water retention curves from four soil depths, saturated hydraulic conductivity from four soil depths and the metribuzin partition coefficient. The calibrated parameters were macropore radius, surface crust saturated hydraulic conductivity, kinetic parameters, irreversible binding parameters and metribuzin half-life. The results indicate that (1) simulated metribuzin persistence was more accurate using the EK (root mean square error, RMSE = 0.03 kg ha -1) and EB (RMSE = 0.03 kg ha-1) sorption models compared to the EO (RMSE = 0.08 kg ha-1) model because of slowing metribuzin degradation rate with time and (2) simulating macropore flow resulted in prediction of metribuzin transport in percolate over the simulation period within a factor of two of that observed using all three pesticide sorption models. Moreover, little difference in simulated daily transport was observed between the three pesticide sorption models, except that the EB model substantially under-predicted metribuzin transport in runoff and percolate >30 days after application when transported concentrations were relatively low. This suggests that when macropore flow and hydrology are accurately simulated, metribuzin transport in the field may be adequately simulated using a relatively simple, equilibrium-only pesticide model." |
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| Language: | English |
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| References: | 29 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Malone, R. W., L. Ma, R. D. Wauchope, L. R. Ahuja, K. W. Rojas, Q. Ma, et al. 2004. Modeling hydrology, metribuzin degradation and matribuzin transport in macroporous tilled and no-till silt loam soil using RZWQM. Pest Manage. Sci. 60(3):p. 253-266. |
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| DOI: 10.1002/ps.738 |
| Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1002/ps.738/full
Last checked: 02/28/2014
Access conditions: Item is within a limited-access website
http://onlinelibrary.wiley.com/enhanced/doi/10.1002/ps.738
Last checked: 02/28/2014
Access conditions: Item is within a limited-access website
Notes: Enhanced HTML version
http://onlinelibrary.wiley.com/doi/10.1002/ps.738/pdf
Last checked: 02/28/2014
Requires: PDF Reader
Access conditions: Item is within a limited-access website |
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MSU catalog number: SB 951 .A1 P45 |
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