Abstract
Abstract The persistence of aldicarb in groundwater of the fractured, sandstone aquifer of Prince Edward Island, Canada is assessed. Two potato fields were instrumented with nests of piezometers which were used in the hydraulic and chemical testing of the sandstone aquifer. Groundwaters were sampled and analysed for pH, EH, dissolved oxygen and ammonia, major ions and the toxic aldicarb species - aldicarb, aldicarb sulfoxide and aldicarb sulfone. Aldicarb persistence appears related to (1) its application at time of planting when soil water temperatures are low (<10°C) and (2) the inhibiting pH effect that the oxidation of ammonia-based fertilizers has on aldicarb degradation. It is recommended that aldicarb (i.e. Temik) be applied at the time of plant emergence rather than seeding, and only where the depth to the water table is 5 metres or more.
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