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Phosphorus Runoff

Effect of Tillage and Soil Phosphorus Levels

^a Dep. of Crop Sciences, 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801
^b Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI 48824-1325

View larger version (17K): [in a new window]   Fig. 1. Relationship between runoff dissolved reactive phosphorus (DRP) concentration and Bray P1 soil extraction values for no-till plots.

View larger version (17K): [in a new window]   Fig. 2. Relationship between runoff dissolved reactive phosphorus (DRP) load and Bray P1 soil extraction values for no-till plots.

View larger version (15K): [in a new window]   Fig. 3. Relationship between runoff dissolved reactive phosphorus (DRP) concentration and Bray P1 soil extraction values for chisel-plowed plots.

View larger version (14K): [in a new window]   Fig. 4. Relationship between runoff dissolved reactive phosphorus (DRP) load and Bray P1 soil extraction values for chisel-plowed plots.

View larger version (42K): [in a new window]   Fig. 5. Relationship between runoff total phosphorus (TP) concentration, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: indicates chisel-plowed plots, indicates no-till plots. The TP concentration = -0.08 + 0.003B1 + 0.53SED - 2 x 10-6 B12; R2 = 0.77, P = 0.001.

View larger version (40K): [in a new window]   Fig. 6. Relationship between runoff total phosphorus (TP) load, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: indicates chisel-plowed plots, indicates no-till plots. The TP load = -0.02 + 0.0003B1 + 0.06SED - 0.0001B1 x SED; R2 = 0.44, P = 0.001.

View larger version (41K): [in a new window]   Fig. 7. Relationship between runoff algal-available phosphorus (AAP) concentration, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: indicates chisel-plowed plots, indicates no-till plots. The AAP concentration = 0.1 + 0.0013B1 - 0.035SED + 4.4 x 10-4 B1 x SED - 5.7 x 10-7 B12; R2 = 0.82, P = 0.001.

View larger version (34K): [in a new window]   Fig. 8. Relationship between runoff algal-available phosphorus (AAP) load, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: indicates chisel-plowed plots, indicates no-till plots. The AAP load = 0.017 + 0.001B1 - 0.005SED + 3.3 x 10-5 B1 x SED; R2 = 0.42, P = 0.001.