Phosphorus in soil and groundwater. Concentration of total phosphorus (mg/kg) in soil B-horizon at the feedlot is indicated in the solid colors. Contours lines show the mean concentration of total phosphorus (mg/L) recorded during the monitoring period. Dots show the locations of soil samples, with narrow gray boxes indicating former feedlot pens. Small triangles are shallow groundwater monitoring wells. The X- and Y-scales are in UTM zone 14 coordinates (NAD83, in meters). DOI: https://doi.org/10.1525/elementa.271.f6