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

ABSTRACT

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.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Wageningen Agricultural University, 3 De Dreijen, 6703 BC Wageningen, The Netherlands.

² Chemist and Soil Scientists, respectively.

Received for publication April 1, 1983. Accepted for publication January 11, 1984.

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