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Published in Soil Sci Soc Am J 29:154-158 (1965)
© 1965 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Self-Diffusion Coefficients of Phosphorus in Soil Measured by Transient and Steady-State Methods1

S. R. Olsen, W. D. Kemper and J. C. Van Schaik2

ABSTRACT

Self-diffusion coefficients of P in soil were measured by two independent methods and by calculating Dp from chloride diffusion. All three methods yielded similar values for Dp at low moisture suctions. On Apishapa silty clay loam, values of Dp ranged from 0.4 x 10-7 to 15.5 x 10-7 cm2/sec as the volumetric moisture content increased from 0.22 to 0.55, or as the soil moisture suction decreased from 6 to < 0.1 bar. From these values of Dp a self-diffusion coefficient for P in bulk solution was calculated, which agreed closely with the experimentally measured value. The transient state method required a separate evaluation of a capacity factor which varied between 100 to 300. If this capacity factor had been omitted, the apparent Dp would have been smaller by 100- to 300-fold. These results demonstrate the necessity of measuring a capacity factor when Dp is to be determined by a transient state method.

NOTES

1 Contribution from Northern Plains Branch, Soil and Water Conservation Research Division, ARS, USDA, and the Colorado Agr. Exp. Sta., Scientific Journal Series 954. Presented before Div. S-2, Soil Science Society of America, Nov. 20, 1963, at Denver, Colo.

2 Research Soil Scientist, USDA; Soil Scientist, USDA and Associate Agronomist (Soils), Colorado State University, Fort Collins, Colo.; and Research Officer, Canada Agr. Res. Sta., Lethbridge, Alberta, Canada, respectively.

Received for publication July 24, 1964. Accepted for publication October 15, 1964.






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