Leaching of glyphosate and AMPA as affected by the time elapsed between spraying first leaching event was studied on large-scale lysimeters in a two-year study. The events were induced irrigation interventions able to deliver 336 L, equivalent rainfall 40 mm. Four groups three randomly selected 12 available. They irrigated either one day after herbicide treatment (1 DAT), 7 DAT, 14 DAT or 28 DA...