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.

Occurrence of glyphosate and AMPA in an agricultural watershed from the southeastern region of Argentina

“…Particularly, Aparicio et al (2013), found pesticide levels in surface soil from Buenos Aires province, one of the most important soybean production areas, which ranged between 0.035-1.502 μg/g and 0.299-2.256 μg/g for glyphosate and AMPA, respectively. The relationship of a glyphosate-based commercial product and phosphorus fertilizer application in a runoff experiment was recently evaluated in Aquic Argiudoll soil (Sasal et al, 2015). However, there is no evidence of field studies about glyphosate behavior through soil profile and its potential transport to groundwater.…”

Determinación De La Concentración De Glifosato en Agua Mediante La Técnica De Inmunoabsorción Ligada a Enzimas (Elisa)

“…En el periodo julio de 2009 -noviembre de 2012 fueron recolectadas 93 muestras de agua de escorrentía en sistemas agrícolas (Cuadro I): 36 obtenidas mediante la utilización de un simulador de lluvia (Sasal et al 2015; Fig. 2) y 57 en parcelas de escorrentía (con diferentes secuencias de cultivo) recolectadas a posteriori de eventos de precipitación que generan escurrimientos con lluvia natural ; Fig.…”

“…Las mayores concentraciones de glifosato fueron registradas con simulaciones de lluvia de alta intensidad, inmediatamente posteriores a las aplicaciones del herbicida (Sasal et al 2015). …”

Resposta Diferencial Das Culturas De Milho Rr E Soja Rr À Exposição a Glyphosate E Adubação Fosfatada

“…Há interação entre a adubação fosfatada e o comportamento do glyphosate no solo (Sasal et al, 2015), além de haver evidências da interação entre o glyphosate e o fósforo do solo sobre a ação do herbicida nas plantas (Clua et al, 2012). Savin et al (2009) observaram alteração significativa na infecção por fungos micorrízicos arbusculares em soja, milho e algodão, resistentes ao glyphosate, submetidos à adubação fosfatada ou não, em solos pobres em fósforo; no entanto, essa alteração pode ser dependente de outras na microbiota do solo, por influência de outros fatores.…”