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The effect of various crops on bromide leaching to shallow groundwater under natural rainfull conditionsIragavarapu, T. K.; Posner, J. L., and Bubenzer, G. D. The effect of various crops on bromide leaching to shallow groundwater under natural rainfall conditions. Journal of Soil and Water Conservation. 1998; 53(2):146-151. AbstractNitrates in drinking water are a major concern in Wisconsin and other midwestern states. A field investigation was conducted on a somewhat poorly drained silt loam soil in southeastern Wisconsin to study the effect of various crops on leaching of a non-adsorbed tracer to shallow water table. Monitoring wells to ground water were installed to a 4-m depth in selected plots planted to corn, soybean, and alfalfa in the spring of 1991. Bromide (which moves somewhat similar to nitrate-N in the soil) was surface-applied around each monitoring well in May 1991. Dry weather early in the growing season resulted in the formation of deep cracks in the field. Bromide was detected to a 80-cm depth in the soil under all crops with only 170 mm of accumulated rainfall by August 1991 and was not predicted to move that fast based on piston-flow model. Bromide was presumably washed down the soil cracks during the sporadic rainfall events. Monitoring wells sampled in December 1991 showed detectable amounts of Br- in the ground water (1.2-m deep) under all the crops. The amount of Br- recovered (soil+tissue) varied with the type of crop grown. The impact of crops was minimal, however, on the rapid movement of Br- through the root zone and ultimately to the ground water. Greater potential for shallow groundwater pollution by non-adsorbed agri-chemicals exists on these medium-textured silt loam soils than previously believed. Available online at Proquest library.
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