Fig. 1. Relationship between total dissolved P in runoff [TP(<0.45)] concentrations in surface runoff (mg P L^–1) and Olsen-P (mg P kg^–1) for simulation method and the (A) Vienna (n = 10), (B) Kranzburg (n = 9), (C) Poinsett (n = 10), and (D) Barnes (n = 10) soils. Olsen-P and surface runoff TP(<0.45) relationships for the field plots and packed boxes were based on 0- to 5-cm probe and bulk soil samples, respectively. Regression significant at the P = 0.0001 probability level. Regression significant at 0.001 < P < 0.002 probability level.