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

Bajwa, I.

Communications in Soil Science and Plant Analysis 11(10): 1019-1027


ISSN/ISBN: 0010-3624
DOI: 10.1080/00103628009367100
Accession: 006433240

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To evaluate the impact of soil clay mineralogy on the utilization efficiency of K fertilizers by rice, K fixation studies were made on 14 soil clays having a range of mineralogical compositions. Soil clay with monomineralic beidellite fixed the highest proportion (76%) of the added potash, followed by clays containing either dominant or major vermiculite (51-66%). Fixation was significantly less severe (< 35%) in vermiculitic clay containing hydrous mica. All the clays with mineralogical suites without beidellite or vermiculite, but consisting of montmorillonite, chlorite, hydrous mica, halloysite, kaolinite, and X-ray amorphous material did not fix appreciable amounts (< 18%) of the applied K.