Glyphosate transport through weathered granite soils under irrigated and non-irrigated conditions — Barcelona, Spain
2010
Candela, Lucila | Caballero, Juan | Ronen, Daniel
The transport of Glyphosate ([N-phosphonomethyl] glycine), AMPA (aminomethylphosphonic acid, CH₆NO₃P), and Bromide (Br⁻) has been studied, in the Mediterranean Maresme area of Spain, north of Barcelona, where groundwater is located at a depth of 5.5m. The unsaturated zone of weathered — granite soils was characterized in adjacent irrigated and non-irrigated experimental plots where 11 and 10 boreholes were drilled, respectively. At the non irrigated plot, the first half of the period was affected by a persistent and intense rainfall. After 69days of application residues of Glyphosate up to 73.6μgg⁻¹ were detected till a depth of 0.5m under irrigated conditions, AMPA, analyzed only in the irrigated plot was detected till a depth of 0.5m. According to the retardation coefficient of Glyphosate as compared to that of Br⁻ for the topsoil and subsoil (80 and 83, respectively) and the maximum observed migration depth of Br⁻ (2.9m) Glyphosate and AMPA should have been detected till a depth of 0.05m only. Such migration could be related to the low content of organic matter and clays in the soils; recharge generated by irrigation and heavy rain, and possible preferential solute transport and/or colloidal mediated transport.
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