Fig. 6. Concentration of sediment and dissolved, particulate, and total P in overland flow before and after plowing a high-P Berks soil (495 mg kg^-1 Mehlich-3 P) and from an unplowed low-P (25 mg kg^-1 Mehlich-3 P) and high-P Berks soil (411 mg kg^-1 Mehlich-3 P).