Thibodeau, J., Fuller, L. J. and Chanasyk, D. S. 2007. Determination of solute leaching potential within a hummocky agricultural landscape. Can. J. Soil Sci. 87: 541-549. Leaching of water-soluble contaminants has resulted in degradation of groundwater quality. This research project examined the long-term spatial variability of leaching processes within two hummocky, agricultural landscapes near Bittern Lake, in central Alberta. Analysing the distribution of soil profiles within a landscape, we created a leaching potential index based on a soil profile index (SPI) and plan curvature measurements. The index accurately differentiated locations of very high and high leaching potential from low and very low leaching potential. This index may become a useful tool to determine the variability of leaching within an agricultural landscape, to identify areas of high leaching potential, to determine agricultural best management practices, and to minimize contamination of groundwater.

Thibodeau, J., Chanasyk, D. S. and Fuller, L. J. 2008. Variability of vertical bromide redistribution within a hummocky landscape. Can. J. Soil Sci. 88: 349Á363. Groundwater quality is a major issue for rural communities, and intensive agricultural practices have the potential to contaminate groundwater via leaching. By analysing the movement of a bromide tracer over three slope positions (top, middle and low) within two hummocky landscapes in central Alberta, the intensity of short-term leaching potential was measured, and the accuracy of a leaching potential index was assessed. Concentrations of bromide 1 mg kg (1 were found at a 120-cm depth at each slope position, from both landscapes, after one snowmelt event and one growing season. However, the depth of a bromide concentration 100 mg kg(1 varied significantly among slope positions after the snowmelt event, and after the growing season. The leaching potential index successfully distinguished between high leaching potential, and low and very low leaching potential. This index will become a useful tool to determine the variability of leaching within an agricultural landscape.