Full TGIF Record # 39258
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Web URL(s):https://dl.sciencesocieties.org/publications/jeq/pdfs/25/6/JEQ0250061186
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Publication Type:
i
Refereed
Author(s):Gonzalez, Javier M.; Ukrainczyk, Ljerka
Author Affiliation:Department of Agronomy, Iowa State University, Ames, IA 50011
Title:Adsorption and desorption of nicosulfuron in soils
Source:Journal of Environmental Quality. Vol. 25, No. 6, November/December 1996, p. 1186-1192.
Publishing Information:Madison, Wisconsin: American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
# of Pages:7
Keywords:TIC Keywords: Adsorption; Desorption; Nicosulfuron; Leaching; Clay minerals; Soils; Herbicides; Groundwater
Abstract/Contents:"Nicosulfuron (2-[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbon-yl]amino] sulfonyl]-N,N-dimethyl-3-pyridinnecarboxamide) is a new, low-rate, sulfonylurea herbicide that is being promoted for weed control in corn (Zea mays L.); however, there is a lack of published information on its behavior in soils. In this study nicosulfuron sorption was measured in batch experiments, at a 1:2 soil/solution ratio, for 10 Iowa and four Brazilian soils. Adsorption isotherms were nonlinear with K^D[f^D[,ₐ^D[d^D[s values ranging from 0.21 to 8.78 with the highest values obtained for Iowa soils. Nicosulfuron K^D[f^D[,ₐ^D[d^D[s values in Iowa soils were correlated with clay content (r = 0.92), while in Brazilian soils the K^D[f^D[,ₐ^D[d^D[s values were correlated with organic C content (r = 0.97). These differences are interpreted in terms of different clay mineralogy of Iowa (expandable 2:1 clay minerals) and Brazilian soils (kaolinite, Al and Fe oxides). Nicosulfuron desorption isotherms, obtained using one-step extraction with 5 × 10⁻³ M CaCl₂, were nearly single valued with adsorption isotherms in soils with pH>5.5, while hysteresis was observed in soils with pH <5.5. Up to 100% of the nicosulfuron was desorbed from Brazilian soils in one desorption step with a 2:1 acetonitrile/water mixture. Only 50 to 70% of adsorbed nicosulfuron could be desorbed with the same extractant from Iowa soils, possibly due to chemisorption of nicosulfuron on 2:1 clay minerals. This study suggests that nicosulfuron will not be highly mobile in the soils with a 2:1 clay mineralogy indicating that in such soils its potential to leach to groundwater may be lower than that of other sulfonylurea herbicides."
Language:English
References:30
Note:Figures
Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Gonzalez, J. M., and L. Ukrainczyk. 1996. Adsorption and desorption of nicosulfuron in soils. J. Environ. Qual. 25(6):p. 1186-1192.
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https://dl.sciencesocieties.org/publications/jeq/pdfs/25/6/JEQ0250061186
    Last checked: 12/12/2016
    Requires: PDF Reader
    Notes: Item is within a limited-access website
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