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Rate of Potassium Release from Fixed and Native Forms
Author(s) -
Ellis Boyd G.,
Mortland M. M.
Publication year - 1959
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/sssaj1959.03615995002300060025x
Subject(s) - biotite , vermiculite , weathering , mica , potassium , mineralogy , chemistry , mineral , geology , materials science , geochemistry , composite material , quartz , organic chemistry
The rate of release of K from fixed and native forms was compared utilizing a biotite‐vermiculite system. Although X‐ray diffraction patterns of oriented aggregates showed little difference between native biotite and weathered biotite containing fixed K, there was a marked difference in the rates of K release from the two materials. The release from native biotite was maintained at nearly a constant rate while approximately 50% of the K was removed, whereas with the fixed forms, rate of release decreased with time. The relationship between the logarithm of the rate of release and time was linear. The slopes of these curves were directly related to the extent of weathering which the weathered biotite had undergone before being subjected to the fixation reaction. The ease of release of fixed K therefore appears to be a function of the extent of weathering of the mica. This may be the result of loss of charge in the mineral during weathering.