Fig. 1. Manure treatment effects on cumulative dissolved reactive P (DRP) load in natural runoff, November 1999 to July 2000. Asterisks indicate significant treatment differences (P =0.05) in cumulative DRP load, at the dates specified. LPD-56 = low P diet manure applied at 56 wet Mg ha^-1; HPD-56 = high P diet manure applied at 56 wet Mg ha^-1.