Soil clay mineralogies in relation to fertility management effect of soil clay mineral compositions on phosphorus fixation under conditions of wetland rice culture

Bajwa, M.I.

Communications in Soil Science and Plant Analysis 12(5): 475-482


ISSN/ISBN: 0010-3624
DOI: 10.1080/00103628109367167
Accession: 006433239

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P fixation in soil occurs mainly in the clay fraction, the mineralogical nature of which varies widely. P sorption characteristics of 14 soil clays having divergent mineral compositions were studied with P concentrations approximating those in fertilized soils because insufficient data were found in the literature on the role of various soil clay mineral species in P fixation. Clays with dominant kaolinite or halloysite fix > 75% of the applied P, followed by those with major kaolinite or halloysite or dominant X-ray amorphous materials (60-70% fixation). Beidellitic clays fix more P (50%) than montmorillonitic clays (45%), which in turn sorb more P than vermiculitic clays (29%).