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This article in SSSAJ

  1. Vol. 48 No. 3, p. 545-548
    Received: Apr 1, 1983



Phosphate Sorption by Soils: III. The P Diffusion-Precipitation Model Tested for Three Acid Sandy Soils1

  1. W. H. van Riemsdijk,
  2. A. M. A. van der Linden and
  3. L. J. M. Boumans2



A recently developed diffusion-precipitation model was tested for three acid sandy soils: two topsoils and one subsoil. It is shown that experimental data fit the model when constant P concentrations are used. As the model predicts no particular curve, third degree polynomials were used to describe the data. For further testing, increasing and decreasing P concentrations were used. Comparison of experimental and computer simulation data show that the model is also valid for varying concentrations. The concentration at the metal-oxide/metal-phosphate interface (indicated as C4) is relatively high: 0.1 to 0.25 mmol/L. The diffusion-precipitation model is useful in modeling P behavior in soils.

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