Fig. 9. Relationship between algal-available phosphorus (AAP) concentrations in runoff from incorporated treatments (including control), sediment (SED) concentration in runoff, and Bray P1 (B1) soil extraction value. AAP concentration = 0.0018B1 + 0.016SED + 0.00017B1 x SED; R2 = 0.85, P = 0.001.