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Phosphorus Losses in Furrow Irrigation Runoff

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

View larger version (20K): [in a new window]   Fig. 1. Linear relationships between average runoff dissolved reactive phosphorus (DRP) and iron-oxide impregnated paper–extractable phosphorus from unfiltered runoff water (FeO-Pw) concentrations, and furrow soil P tests (r2 > 0.12 significant at 5% probability).

View larger version (11K): [in a new window]   Fig. 2. Linear relationships between average runoff dissolved reactive phosphorus (DRP) concentrations and ratio of either bicarbonate-extractable inorganic phosphorus from furrow soil (Fur-Pi) or iron-oxide impregnated paper–extractable phosphorus from furrow soil (FeO-Ps) divided by phosphorus sorption index (PSI) (r2 > 0.12 significant at 5% probability).