Full TGIF Record # 75913
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Anderson, Adam H.; Simmons, F. William; Simmons, Jennifer J. Crawford
Author Affiliation:Anderson: Research Agronomist, Department of Crop Sciences; Simmons: Professor, Department of Natural Resources and Environmental Sciences; and Simmons: Postdoctoral Researcher, Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL
Title:Degradation of prosulfuron in two Illinois soils as influenced by soil pH
Section:Soil and environmental aspects
Other records with the "Soil and environmental aspects" Section
Meeting Info.:Columbus, OH: December 14-16, 1999
Source:Proceedings of the North Central Weed Science Society. Vol. 55, December 2000, p. 35.
# of Pages:1
Publishing Information:Champaign, IL: North Central Weed Science Society
Keywords:TIC Keywords: Pesticide degradation; Soil pH; Pesticides; Soil microorganisms
Abstract/Contents:"The purpose of this study was to characterize prosulfuron degradation as a function of pH (6.0-7.4), soil type (organic matter 1.5 and 5%), and microbial activity (viable vs. sterile soil). [14C]Prosulfuron was added to soil microcosms which were then periodically sampled over 245 days. The distribution of 14C as CO2, extractable herbicide and metabolites, and unextractable (bound) residue were monitored using liquid scintillation counting and HPLC with 14C-detection. Analytical standards of metabolites were used for metabolite identification by comparing HPLC retention times of standards and samples. Prosulfuron degradation resulted in formation of metabolite CGA-155902 (up to 60% of applied radiocarbon) and 14C-bound residue (to 40% of applied). In general, more rapid and extensive degradation of prosulfuron was observed at higher pH values. First-order T12's of prosulfuron in the viable Cisne at pH 6.0, 6.9, and 7.4 were 52, 35, and 34 days, respectively. In the sterile Cisne, T12's were not reached at pH values of 6.0 and 6.9 and was 41 days at pH 7.4. In the viable Drummer, T12's were 36, 32, and 27 days at pH values 6.2,7.1, and 7.4, respectively, and for the sterile Drummer, T12's were 52, 56, and 39 days at the respective soil pH values. Degradation was more rapid in viable microcosms compared to sterile microcosms, and in the Drummer compared with Cisne. Results suggest that in soils with pH 6.0-7.4, organic matter content and microbial activity may affect degradation to a greater extent than acid hydrolysis mechanisms. The data support previous reports that at higher pH values, prosulfuron is more bioavailable than at lower pH values."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Anderson, A. H., F. W. Simmons, and J. J. C. Simmons. 2000. Degradation of prosulfuron in two Illinois soils as influenced by soil pH. Proc. North Cent. Weed Sci. Soc. 55:p. 35.
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