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Phosphorus Leaching in Relation to Soil Type and Soil Phosphorus Content

Department of Soil Sciences, Swedish University of Agricultural Sciences, Box 7072, S-750 07 Uppsala, Sweden

View larger version (42K): [in a new window]   Fig. 1. Annual amounts of leachate over three years. Each bar is the mean of two replicates and the range bars refer to leachate amounts during the whole 3-yr period.

View larger version (36K): [in a new window]   Fig. 2. Volume-weighted concentrations of dissolved reactive phosphorus (DRP) and unreactive phosphorus (UP) during the whole 3-yr period in the different soils and treatments. Each bar is the mean of two replicates and the range bars refer to leached amounts of total phosphorus (TP = DRP + UP).

View larger version (48K): [in a new window]   Fig. 3. Annual leaching of dissolved reactive phosphorus (DRP) and unreactive phosphorus (UP) during three years in the different soils and treatments. Each bar is the mean of two replicates and the range bars refer to leached amounts of total phosphorus (TP = DRP + UP).

View larger version (17K): [in a new window]   Fig. 4. Olsen P plotted against volume-weighted concentrations of total phosphorus (TP). Each point is the mean of two replicates (±range).

View larger version (16K): [in a new window]   Fig. 5. Phosphorus sorption saturation expressed as the ratio between Olsen P/single-point phosphorus sorption index (PSI1) plotted against volume-weighted concentrations of total phosphorus (TP). Each point is the mean of two replicates (±range).