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Prediction of Phosphorus Diffusion from Fertilizer Source
Author(s) -
Hira G. S.,
Singh N. T.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200040005x
Subject(s) - diffusion , tortuosity , effective diffusion coefficient , phosphorus , fertilizer , diffusion equation , adsorption , chemistry , analytical chemistry (journal) , soil science , materials science , thermodynamics , environmental chemistry , environmental science , porosity , physics , medicine , economy , organic chemistry , radiology , magnetic resonance imaging , economics , service (business)
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, D =D 1 V 1 f I b( Q ) 1 / 2 .Predicted P concentration‐distance profiles were very close to the experimental values estimated by employing a sectioning technique.