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Weathering of Micas by Mycorrhizal Soybean Plants
Author(s) -
Mojallali H.,
Weed S. B.
Publication year - 1978
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1978.03615995004200020033x
Subject(s) - biotite , weathering , phlogopite , muscovite , mineral , mycorrhiza , botany , chemistry , inoculation , horticulture , mineralogy , geology , geochemistry , biology , symbiosis , bacteria , paleontology , quartz , organic chemistry , mantle (geology)
Two biotites, a phlogopite, and a muscovite, ground to yield sandsize flakes, were used as sources of K for soybeans [ Glycine max (L.) Merrill] grown in pot culture with and without vesicular‐arbuscular mycorrhizal association. On the low‐fertility soil used, effects of the mycorrhizae were most pronounced in terms of P uptake. Plants in noninoculated pots were stunted and P deficient; no K deficiency was observed in these plants. Plants grown in inoculated soil were larger and did not exhibit P deficiency symptoms; they were, however, K deficient. When P deficiency was corrected, there was no difference in plant growth attributable to K source, though the micas differed markedly in their abilities to supply soluble K. The mycorrhizae appeared to accelerate weathering of the biotites and the phologopite, but no effect was observed on the muscovite. Electron microprobe analysis showed extensive removal of K and some removal of Al from edges of the readily weathered biotite flakes subjected to biological weathering.