title: Glyphosate loss by runoff and its relationship with phosphorus fertilization.
abstract: The aim of this study was to evaluate the relationship between glyphosate and phosphate fertilizer application and their contribution to surface water runoff contamination. The study was performed in Aquic Argiudoll soil (Tezanos Pinto series). Four treatments were assessed on three dates of rainfall simulation after fertilizer and herbicide application. The soluble phosphorus in runoff water was determined by a colorimetric method. For the determination of glyphosate and aminomethylphosphonic acid (AMPA), a method based on fluorenylmethyloxycarbonyl (FMOC) group derivatization, solid phase extraction (SPE) purification, and ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) was employed. The application of phosphorus fertilizer resulted in an increased loss of glyphosate by runoff after 1 day of application. These results suggest the need for further study to understand the interactions and to determine appropriate application timing with the goal of reducing the pollution risk by runoff.
authors.affiliation: †National Agricultural Technology Institute-Experimental Section Paraná, Ruta Provincial no. 11 km 12.5 (3101), Oro Verde, Entre Rı́os, Argentina.
authors.forename: María Carolina
authors.initials: MC
authors.lastname: Sasal
authors.affiliation: §Program of Research and Analysis of Chemical Residues and Contaminants, National University of Littoral, Santa Fe, Argentina.
authors.forename: Luisina
authors.initials: L
authors.lastname: Demonte
authors.affiliation: #Agricultural Science Faculty, National University of Entre Rı́os, Paraná, Entre Rı́os, Argentina.
authors.forename: Andrea
authors.initials: A
authors.lastname: Cislaghi
authors.affiliation: †National Agricultural Technology Institute-Experimental Section Paraná, Ruta Provincial no. 11 km 12.5 (3101), Oro Verde, Entre Rı́os, Argentina.
authors.forename: Emmanuel A
authors.initials: EA
authors.lastname: Gabioud
authors.affiliation: #Agricultural Science Faculty, National University of Entre Rı́os, Paraná, Entre Rı́os, Argentina.
authors.forename: José D
authors.initials: JD
authors.lastname: Oszust
authors.affiliation: †National Agricultural Technology Institute-Experimental Section Paraná, Ruta Provincial no. 11 km 12.5 (3101), Oro Verde, Entre Rı́os, Argentina.|#Agricultural Science Faculty, National University of Entre Rı́os, Paraná, Entre Rı́os, Argentina.
authors.forename: Marcelo G
authors.initials: MG
authors.lastname: Wilson
authors.affiliation: §Program of Research and Analysis of Chemical Residues and Contaminants, National University of Littoral, Santa Fe, Argentina.
authors.forename: Nicolás
authors.initials: N
authors.lastname: Michlig
authors.affiliation: §Program of Research and Analysis of Chemical Residues and Contaminants, National University of Littoral, Santa Fe, Argentina.
authors.forename: Horacio R
authors.initials: HR
authors.lastname: Beldoménico
authors.affiliation: §Program of Research and Analysis of Chemical Residues and Contaminants, National University of Littoral, Santa Fe, Argentina.
authors.forename: María Rosa
authors.initials: MR
authors.lastname: Repetti
mesh_terms: D005308:Fertilizers / Q000032:analysis*; D005998:Glycine / Q000031:analogs & derivatives* / Q000737:chemistry; D006540:Herbicides / Q000737:chemistry*; D007700:Kinetics; D010758:Phosphorus / Q000737:chemistry*; D011891:Rain; D012989:Soil Pollutants / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D000097797:Glyphosate
chemical_list: D005308:Fertilizers; D005998:Glycine; D006540:Herbicides; D010758:Phosphorus; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D000097797:Glyphosate
keywords: glyphosate; phosphorus fertilization; phosphorus−glyphosate interaction; surface runoff