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Title: The Properties and Genesis of Four Soils Derived from Basaltic Ash, Mauna Loa, Hawaii 
Author: Hassan, Tjetje S.; Ikawa, H.; Swindale, L.D.
Date: 1975-07
Publisher: University of Hawai'i Press
Citation: Hassan TS, Ikawa H, Swindale LD. 1975. The properties and genesis of four soils derived from basaltic ash, Mauna Loa, Hawaii. Pac Sci 29(3): 301-308.
Abstract: The properties and genesis of four soils derived from basaltic ash
are presented. In a sequence of increasing rainfall and elevation (decreasing
temperature), there was a decrease in the values for pH, cation exchange capacity,
the exchangeable bases, and base saturation. On the other hand, there was an
increase in the values for carbon: nitrogen, clay percentages, free iron oxides, and
the ratio of exchangeable calcium: exchangeable magnesium. There was also a
general increase in the carbon content and in the values of the 15-bar water with
increasing rainfall. In comparison with soils derived from andesitic ash, the soils
derived from basaltic ash had high amounts of sand and silt, high pH values, and
high base saturation for similar rainfall. They also had lower organic matter,
carbon: nitrogen ratios, cation exchange capacity, and 15-bar water values. These
differences are attributed to the younger age and to the higher contents of calcium
and magnesium of the basaltic ash.
ISSN: 0030-8870

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