Fig. 10. Relationship between algal-available phosphorus (AAP) load in runoff from incorporated treatments (including control), sediment (SED) load in runoff, and Bray P1 soil extraction (B1) value. AAP load = 0.041B1 + 0.056SED + 0.00043B1 x SED; R2 = 0.80, P = 0.001.