Fig. 2. Comparisons of dissolved reactive phosphorus (DRP) in reverse osmosis water (RO) and a 50:50 mix of RO water and tap water (RO/Tap) versus Olsen P (P_i), water-soluble P (P_ws), and iron-oxide impregnated paper–extractable P (FeO-P_s) soil tests. Regressions differ between RO and RO/Tap runoff waters for P_ws, but not for P_i or FeO-P_s. All regressions are significant (P 0.05).

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