Abstract
In an effort to relate clay mineralogies of some tropical rice soils to their P supplying status, clay mineral compositions of 214 wetland rice soils from the Philippines were determined by x-ray diffractometry, followed by Olsen P estimations on the airdried soil samples.
Soils containing halloysite, kaolinite, and x-ray amorphous components (allophane and imogolite) were found deficient in available P (Olsen P < 10 mg per kg), whereas those containing montmorillonite, beidellite, vermiculite, and hydrous mica were adequate in available P (Olsen P > 10 mg per kg).
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Bajwa, M. Phosphorus status of Philippine rice soils with different clay mineralogical characteristics. Fertilizer Research 3, 435–438 (1982). https://doi.org/10.1007/BF01048946
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DOI: https://doi.org/10.1007/BF01048946