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Phosphorus Runoff from Two Water Sources on a Calcareous Soil

USDA-ARS, Northwest Irrigation and Soils Research Lab., 3793 N. 3600 E., Kimberly, ID 83341

View larger version (23K): [in a new window]   Fig. 1. Comparisons of runoff between reverse osmosis water (RO) and a 50:50 mix of RO water and tap water (RO/Tap) and between soil loss and sediment concentrations in the runoff waters. Regressions, except for sediment concentration, are significant; runoff differed significantly among the three irrigations (P 0.05). Dashes signify 1:1 lines.

View larger version (39K): [in a new window]   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 (Pi), water-soluble P (Pws), and iron-oxide impregnated paper–extractable P (FeO-Ps) soil tests. Regressions differ between RO and RO/Tap runoff waters for Pws, but not for Pi or FeO-Ps. All regressions are significant (P 0.05).

View larger version (39K): [in a new window]   Fig. 3. Comparisons of iron-oxide impregnated paper–extractable phosphorus in runoff water (FeO-Pw) in reverse osmosis water (RO) and a 50:50 mix of RO water and tap water (RO/Tap) versus Olsen P (Pi), water-soluble P (Pws), and iron-oxide impregnated paper–extractable P (FeO-Ps) soil tests. Regressions do not differ among RO and RO/Tap waters, except intercepts differ between RO and RO/Tap runoff waters for Pi. All regressions are significant (P 0.05).

View larger version (23K): [in a new window]   Fig. 4. Total P in reverse osmosis water (RO) and a 50:50 mix of RO water and tap water (RO/Tap) versus sediment concentration. Regressions are significant and they differ from each other (P 0.05).