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Using Soil Phosphorus Profile Data to Assess Phosphorus Leaching Potential in Manured Soils

^a USDA-ARS, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802-3702
^b Dep. Natural Resource Sciences and Landscape Architecture, Univ. Maryland, College Park, MD 20742

View larger version (34K): [in a new window]   Fig. 1. Location of study area and distribution of soils within the FD-36 watershed, central Pennsylvania.

View larger version (22K): [in a new window]   Fig. 2. Map of study area showing 1-m contours and location of sampling sites.

View larger version (76K): [in a new window]   Fig. 3. Soil core leaching setup employed in the study (adapted from McDowell and Sharpley, 2001b).

View larger version (19K): [in a new window]   Fig. 4. Distribution of oxalate-extractable Fe in soil profiles. Error bars represent one standard deviation around the mean of the bulk observation.