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Prediction of Phosphorus Diffusion from Fertilizer Source¹

ABSTRACT

Rate of P diffusion from fertilizer applied at the soil surface was studied using Fick's law of diffusion. The diffusion coefficient of P was determined from a knowledge of the tortuosity factor and P adsorption isotherm. Phosphorus diffusion coefficient calculated from Nye's equation did not prove suitable at very low or high concentration of P at the soil surface. The phosphorus diffusion coefficient calculated from experimental data increased linearly with the square root of P concentration applied at the source. Phosphorus diffusion coefficient could be calculated from the equation,
Predicted P concentration-distance profiles were very close to the experimental values estimated by employing a sectioning technique.

¹ Contribution from the Department of Soils, Punjab Agric. Univ., Ludhiana, India.

² Assistant Soil Physicist and Senior Soil Physicist, respectively.

Received for publication December 1, 1977. Accepted for publication March 23, 1978.

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