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Comparison of PRZM and GLEAMS Computer Model Predictions with Field Data for Fluometuron and Norflurazon Behavior in Soil

Published online by Cambridge University Press:  12 June 2017

William T. Willian ,
Thomas C. Mueller ,
Robert M. Hayes ,
David C. Bridges  and
Charles E. Snipes
William T. Willian
Affiliation:
Department of Plant and Soil Science, University of Tennessee, Knoxville, TN 37901-1071
Thomas C. Mueller
Affiliation:
Department of Plant and Soil Science, University of Tennessee, Knoxville, TN 37901-1071
Robert M. Hayes
Affiliation:
Department of Plant and Soil Science, University of Tennessee, Knoxville, TN 37901-1071
David C. Bridges
Affiliation:
University of Georgia, Griffin
Charles E. Snipes
Affiliation:
Mississippi State University, Stoneville, MS
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Abstract

The ability of the pesticide root zone model (PRZM) and the groundwater-loading effects of agricultural management systems (GLEAMS) model to predict movement of two herbicides in soil was evaluated using site-specific environmental data from sites in three states. Predictions of herbicide movement with site-specific data were compared to predictions using more generalized database soil and pesticide data within each model. Field experiments examined fluometuron and norflurazon movement in three soils representative of the cotton-growing regions of the southeastern United States. In comparing the use of site-specific vs. database values, the small increase in accuracy using site-specific inputs would not justify the large cost to obtain the data. The databases for each model gave predictions similar to those using the site-specific numbers. Both the PRZM and the GLEAMS model had similar accuracy levels in predicting the presence of fluometuron or norflurazon present in three surface soils, although each model tended to overpredict movement and total herbicide concentration, especially at lower herbicide concentrations. At higher herbicide concentrations, prediction accuracy was less than that probably needed to predict agronomically relevant herbicide concentrations in surface soils.

Keywords

Fluometuron, N,N-dimethyl-N'-[3-(trifluoromethyl)phenyl]ureanorflurazon, 4-chloro-5-(methylamino)-2-(3-(trifluoromethyl)phenyl)-3(2H)-pyridazinonecotton, Gossypium hirsutum L.Model validationdegradationdissipationadsorptionherbicidecottonDB, database values used in computer simulationsDAT, days after treatmentDT50, half-life or 50% disappearance (in days)GLEAMS, groundwater loading effects of agricultural management systemsKd, soil–solution distribution coefficientk, first-order dissipation rate constantKoc, calculated organic carbon sorption coefficientSS, site-specific values used in computer simulationsPRZM, pesticide root zone model
Type
Research
Information
Weed Technology , Volume 13 , Issue 3 , September 1999 , pp. 561 - 570
Copyright
Copyright © 1999 by the Weed Science Society of America 

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