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Ionic Relationships in the Pedogenesis of Hawaiian Soils
Author(s) -
Swindale L. D.,
Uehara G.
Publication year - 1966
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/sssaj1966.03615995003000060021x
Subject(s) - pedogenesis , soil water , ultisol , oxisol , gibbsite , mica , potassium , soil science , chemistry , saturation (graph theory) , environmental chemistry , mineralogy , geology , mathematics , kaolinite , paleontology , combinatorics , organic chemistry
A pedogenic mica is believed to be present in a sequence of Hawaiian soils, the lower, drier members of which are Oxisols and the upper, wetter members Ultisols. The mica decreases with depth within each soil and increases generally with increasing rainfall and elevation. Direct relationships exist between the amount of mica in the soils and the amount of exchangeable potassium per unit of base saturation, and between the amount of mica and the concentration of potassium in the soil solution. The parameters, log [K + ]/[H + ] and log [H 4 SiO 4 ], of the mass action equations between mica, kaolin, and gibbsite, when measured for the soil solutions, are useful indicators of the probable stabilities of the minerals in the soils. Tests of physical models of the chemical system involved indicate that the exchangeable potassium and the potassium in the soil solutions as measured are not in equilibrium with the minerals in the soils.