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Published online 12 October 2005
Published in J Environ Qual 34:1944-1951 (2005)
DOI: 10.2134/jeq2004.0468
© 2005 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Environmental Index for Estimating the Risk of Phosphorus Loss in Calcareous Soils of Manitoba

D. V. Ige, O. O. Akinremi* and D. N. Flaten

Department of Soil Science, University of Manitoba, Winnipeg, Canada R3T 2N2



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  		Fig. 1. Relationship between water-extractable phosphorus (PH2O) and degree of phosphorus saturation estimated as the ratio of either Olsen (POls) or Mehlich 3 (PM3)–extractable P to P sorption indices. CaM3, Mehlich 3–extractable Ca; (Ca + Mg)M3, the sum of Mehlich 3–extractable Ca and Mg; P150, P sorption index at 150 mg L–1 of added P; ESmax, estimated Langmuir adsorption. All relationships are significant at p < 0.01 (n = 112). Three points with PH2O values of 0.9, 1.1, and 2.3 mmol kg–1 were statistically shown to be outliers and were eliminated from the regression plot.

 


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  		Fig. 2. Relationship between different measures of degree of phosphorus saturation (DPS). The DPS is estimated as the ratio of either Olsen (POls) or Mehlich 3 (PM3)–extractable P to P sorption indices. CaM3, Mehlich 3–extractable Ca; (Ca + Mg)M3, the sum of Mehlich 3–extractable Ca and Mg; P150, P sorption index at 150 mg L–1 of added P; ESmax, estimated Langmuir adsorption.

 




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