Journal ArticleDOI
Fate and transport of glyphosate and aminomethylphosphonic acid in surface waters of agricultural basins.
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TLDR
Glyphosate use in a watershed results in some occurrence in surface water; however, the watersheds most at risk for the offsite transport of glyphosate are those with high application rates, rainfall that results in overland runoff and a flow route that does not include transport through the soil.Abstract:
BACKGROUND: Glyphosate [N-(phosphonomethyl)glycine] is a herbicide used widely throughout the world in the production of many crops and is heavily used on soybeans, corn and cotton. Glyphosate is used in almost all agricultural areas of the United States, and the agricultural use of glyphosate has increased from less than 10000 Mg in 1992 to more than 80000 Mg in 2007. The greatest intensity of glyphosate use is in the midwestern United States, where applications are predominantly to genetically modified corn and soybeans. In spite of the increase in usage across the United States, the characterization of the transport of glyphosate and its degradate aminomethylphosphonicacid (AMPA) on a watershed scale is lacking. RESULTS: Glyphosate and AMPA were frequently detected in the surface waters of four agricultural basins. The frequency and magnitude of detections varied across basins, and the load, as a percentage of use, ranged from 0.009 to 0.86% and could be related to three general characteristics: source strength, rainfall runoff andflow route. CONCLUSIONS: Glyphosate use in a watershed results in some occurrence in surface water; however, the watersheds most at risk for the offsite transport of glyphosate are those with high application rates, rainfall that results in overland runoff and a flow route that does not include transport through the soil. c � 2011 Society of Chemical Industryread more
Citations
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Journal ArticleDOI
The overlooked impact of rising glyphosate use on phosphorus loading in agricultural watersheds.
TL;DR: The use of glyphosate adds phosphorus (P) to agricultural landscapes, influencing the accumulation and cycling of P in soil and nearby surface waters as discussed by the authors, but pesticides have been largely ignored when monitoring anthropogenic sources of phosphorus in agricultural watersheds.
Journal ArticleDOI
Residues of the herbicide glyphosate in riparian groundwater in urban catchments
TL;DR: Glyphosate and AMPA were detected in shallow riparian groundwater at 4 of 5 stream sites in urban catchments in Canada and each were found in approximately 1 in 10 of the samples overall, suggesting that the AMPA is derived mainly from glyphosate degradation rather than from wastewater sources.
Journal ArticleDOI
Short-term transport of glyphosate with erosion in Chinese loess soil — A flume experiment
Xiaomei Yang,Xiaomei Yang,Xiaomei Yang,Fei Wang,Fei Wang,Célia P.M. Bento,Sha Xue,Sha Xue,Lingtong Gai,Ruud van Dam,Hans G.J. Mol,Coen J. Ritsema,Violette Geissen,Violette Geissen +13 more
TL;DR: The transport of glyphosate and its metabolite aminomethylphosphonic acid (AMPA) related to soil erosion at two slope gradients, two rates of pesticide with a formulation of glyphosate (Roundup®) application, and a rain intensity of 1.0 mm min(-1) for 1 h on bare soil in hydraulic flumes was focused on.
Journal ArticleDOI
Freshwater Bacteria Release Methane as a By-Product of Phosphorus Acquisition
TL;DR: Demethylation of methylphosphonate may also contribute to methane release from lakes and that phosphate can repress this activity, and it is suggested that some of the excess methane in the Lake Matano surface water, and in other methane-rich lakes, may be produced by P-starved bacteria.
Journal ArticleDOI
Glyphosate and AMPA in the estuaries of the Baltic Sea method optimization and field study
TL;DR: The data obtained in this study clearly depict the transport of glyphosate and AMPA to the Baltic Sea and detailed fate and risk assessment for both contaminants in marine environments are required.
References
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Book ChapterDOI
Ecotoxicological Risk Assessment for Roundup ® Herbicide
TL;DR: Glyphosate-based weed control products are among the most widely used broad-spectrum herbicides in the world and have been extensively investigated for their potential to produce adverse effects in nontarget organisms as discussed by the authors.
Journal ArticleDOI
The Pesticide Content of Surface Water Draining from Agricultural Fields—A Review
TL;DR: The literature on pesticide losses in runoff waters from agricultural fields is reviewed in this paper, where the majority of commercial pesticides, total losses are 0.5%0 or less of the amounts applied, unless severe rainfall conditions occur within 1-2 weeks after application.
Journal ArticleDOI
Adsorption, Mobility, and Microbial Degradation of Glyphosate in the Soil
TL;DR: Glyphosate [N-(phosphonomethyl)glycine] was readily bound to kaolinite, illite, and bentonite clay and to charcoal and muck but not to ethyl cellulose as mentioned in this paper.
Journal ArticleDOI
The current status and environmental impacts of glyphosate-resistant crops: a review.
TL;DR: Glyphosate-resistant crops have promoted the adoption of reduced- or no-tillage agriculture in the USA and Argentina, providing a substantial environmental benefit and the development and use of failsafe introgression barriers in crops with such linked genes is needed.
Journal ArticleDOI
Hydrologic evaluation of the soil and water assessment tool for a large tile-drained watershed in iowa
TL;DR: In this paper, the Soil and Water Assessment Tool (SWAT) water quality model is designed to assess nonpoint and point source pollution and was recently modified for tile drainage.