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- W2330403912 abstract "Three new herbicides, a fungicide, and an insecticide were tested for their ability to leach in various tropical soils in Hawaii. In addition, atrazine and bromide ions were used as two reference chemicals in the study. Label rates of these chemicals for agriculture or insecticidal use were applied to tilled soils. Five test sites at differing topographic, climatic and soil conditions were selected in the Hawaiian islands: three on Oahu, one on Maui and one on Kauai. Each site had four test plots; two for herbicides and two for insecticide/fungicide. No crops were grown and the soil surface was covered with a thin layer of mulch to prevent weed growth and decrease water evaporation from the soil surface. An irrigation system was set up at each site to apply water at close to potential evapotranspiration rate to induce leaching. Disturbed soil samples were collected on the day after pesticide application and in one to four week intervals for four months. Soil hydraulic and climatic data from each site were collected during the same period. Soil samples collected in the field to a depth of 2.1 m were analyzed for content of the chemicals, yielding concentration profiles for elapsed times of 1 day to 16 weeks. Prior to pesticide application, soil profiles have been also characterized for pH, pH, organic carbon content and basic nutrients: P, K, Mg, Ca. Undisturbed soil core samples have been taken and sets of water -retention curves have been determined in the laboratory. Field tests for unsaturated and saturated hydraulic conductivity using tension disc infiltrometers have been carried out at all sites. In addition, laboratory tests on the sorption and degradation of the chemical compounds are being carried out." @default.
- W2330403912 created "2016-06-24" @default.
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- W2330403912 date "2004-06-25" @default.
- W2330403912 modified "2023-10-18" @default.
- W2330403912 title "Evaluating the Transport of Pesticides in Tropical Soils in Hawaii" @default.
- W2330403912 cites W2029747070 @default.
- W2330403912 doi "https://doi.org/10.1061/40737(2004)217" @default.
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