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Artificial Weathering of Oxidized Biotite: III. Potassium Uptake by Subterranean Clover¹

ABSTRACT

Potassium uptake from biotites by subterranean clover decreased as the proportion of oxidized Fe in octahedral sites increased. The relative availability of K from sequentially oxidized biotites may be predicted by sodium tetraphenylboron extraction.

No major changes in mica structure due to removal of interlayer K by plants were detected.

¹ Contribution from the Dep. of Soil Science and Plant Nutrition, Institute of Agriculture, Univ. of Western Australia, Nedlands, Western Australia 6009.

² Senior Lecturer in Soil Sci. and Res. Officer, respectively.

Received for publication May 24, 1973. Accepted for publication August 27, 1973.