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Characterization of Aluminum in Volcanic Ash Soils
Author(s) -
Igue K.,
Fuentes R.
Publication year - 1972
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/sssaj1972.03615995003600020026x
Subject(s) - andosol , soil water , lime , chemistry , salt (chemistry) , volcanic ash , weathering , environmental chemistry , allophane , mineralogy , volcano , geology , soil science , geochemistry , paleontology
Buffered and unbuffered salt solutions were used to characterize Al in acid volcanic ash soils of Costa Rica. The results presented show that the exchangeable Al in the Andosols studied are relatively low as determined by successive extractions with unbuffered salt solutions. When different soils were compared, exchangeable Al seemed to increase as weathering of the soils increased. Buffered 1 N NH 4 OAc at low pH's releases considerable amounts of nonexchangeable Al. In a well developed Andosol, part of nonexchangeable Al seems to be released from organically complexed forms. In more weathered soils, the inorganic forms of Al seemed to be the main source of nonexchangeable fractions. The method of successive extractions with unbuffered salt solutions appeared to provide a reliable measuremnt of exchangeable and nonexchangeable Al. Both 1 N KCl and 1 N NH 4 Cl generally extracted similar amounts of Al from soils, and both methods are very sensitive to detect differences due to lime treatments or organic matter destruction.