Inorganic phosphorus applied in highly weathering soil can be adsorbed to oxides and/or precipitate with iron, aluminum or calcium.
There is an analytical method to assess the difference between this forms of phosphorus bonds in soil?
Adsorption is a physical phenomenon, while precipitation is a chemical phenomenon..
An analytical method suitable to determine the differences would be X-ray absorption near-edge structure (XANES) spectroscopy at a synchrotron facility. The following citations show spectral differences between adsorbed and co-precipitated phosphate:
Solid-State Speciation of Natural and Alum-Amended Poultry Litter Using XANES Spectroscopy
D. Peak*, J. T. Sims and, and D. L. Sparks
Environmental Science & Technology 2002 36 (20), 4253-4261
DOI: 10.1021/es025660d
XAFS study of adsorbed and mineral forms of phosphate
D. Hesterberg, W. Zhou, K. J. Hutchison, S. Beauchemin and D. E. Sayers
J. Synchrotron Rad. (1999). 6, 636-638
https://doi.org/10.1107/S0909049599000370