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An urgent need exists for applicable methods to predict areas at risk of pesticide contamination within agricultural catchments. As such, an attempt was made to predict and validate contamination in nine separate sub-catchments of the Lourens River, South Africa, through use of a geographic information system (GIS)-based runoff model, which incorporates geographical catchment variables and physicochemical...
Constructed wetlands have been widely used to treat different types of agricultural point and nonpoint source pollution including nutrients, sediments and some herbicides. However, very little is known about the effectiveness of constructed wetlands in controlling nonpoint source insecticide pollution. Here we describe the concentrations of total suspended solids (TSS), nutrients and spraydrift-borne...
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