Alachlor Transport in Laboratory Soil Columnsby Mutasem El-Fadel,
Abstract: Spraying of agricultural chemicals result in their travel downward through the unsaturated zone and adsorption to the surrounding soil. Infiltration from rainfall and irrigation solubilize these chemicals and carry the dissolved components to the ground water. This process can cause soil and ground water contamination. The extent of this contamination is greatly influenced by soil characteristics, the rate and method of chemical application. This paper presents experimental and mathematical results describing the transport of the herbicide Alachlor in laboratory soil columns with variable length, initial moisture content, and Alachior application rate and method. The time- dependent distribution of Alachior concentration from selected experiment is simulated using a numerical flow and transport model. The model was also used to conduct a sensitivity analysis with respect to soil and chemical properties and to identify parameters controlling Alachior transport in porous media.
Subject Headings: Soil pollution | Chemicals | Soil water | Soil analysis | Numerical models | Sensitivity analysis | Groundwater pollution
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