Fig. 7. Relationship between particulate enrichment and sediment discharge of overland flow before and after plowing a high-P Berks soil (495 mg kg^-1 Mehlich-3 P) and unplowed low-P (25 mg kg^-1 Mehlich-3 P) and high-P Berks soil (411 mg kg^-1 Mehlich-3 P).