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Phosphorus Runoff

Effect of Tillage and Soil Phosphorus Levels

I. C. Daverede*,a, A. N. Kravchenkob, R. G. Hoefta, E. D. Nafzigera, D. G. Bullocka, J. J. Warrena and L. C. Gonzinia

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



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Fig. 1. Relationship between runoff dissolved reactive phosphorus (DRP) concentration and Bray P1 soil extraction values for no-till plots.

 


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Fig. 2. Relationship between runoff dissolved reactive phosphorus (DRP) load and Bray P1 soil extraction values for no-till plots.

 


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Fig. 3. Relationship between runoff dissolved reactive phosphorus (DRP) concentration and Bray P1 soil extraction values for chisel-plowed plots.

 


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Fig. 4. Relationship between runoff dissolved reactive phosphorus (DRP) load and Bray P1 soil extraction values for chisel-plowed plots.

 


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Fig. 5. Relationship between runoff total phosphorus (TP) concentration, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: {circ} indicates chisel-plowed plots, {blacktriangleup} indicates no-till plots. The TP concentration = -0.08 + 0.003B1 + 0.53SED - 2 x 10-6 B12; R2 = 0.77, P = 0.001.

 


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Fig. 6. Relationship between runoff total phosphorus (TP) load, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: {circ} indicates chisel-plowed plots, {blacktriangleup} indicates no-till plots. The TP load = -0.02 + 0.0003B1 + 0.06SED - 0.0001B1 x SED; R2 = 0.44, P = 0.001.

 


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Fig. 7. Relationship between runoff algal-available phosphorus (AAP) concentration, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: {circ} indicates chisel-plowed plots, {blacktriangleup} 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.

 


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Fig. 8. Relationship between runoff algal-available phosphorus (AAP) load, runoff sediment (SED) concentration, and Bray P1 (B1) soil extraction values. Symbols: {circ} indicates chisel-plowed plots, {blacktriangleup} 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.

 





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