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Soils of the Laloanea Farm, Northwestern Upolu, Western Samoa

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Title:Soils of the Laloanea Farm, Northwestern Upolu, Western Samoa
Authors:Morrison, R.J.
Asghar, M.
Date Issued:Jan 1992
Publisher:University of Hawai'i Press
Citation:Morrison RJ, Asghar M. 1992. Soils of the Laloanea Farm, northwestern Upolu, Western Samoa. Pac Sci 46(1): 35-45.
Abstract:Soils of the Laloanea Farm (40 ha), in the uplands of northwestern
Upolu, Western Samoa, were studied by an examination of nine pedons
composing two toposequences, one running S-N and the other W-E across
extensive portions of the farm. Over short distances considerable variability in
the soils has led to their classification into two soil orders of Soil Taxonomy
(Entisols and Inceptisols), two suborders, three great groups (Troporthents,
Humitropepts, and Dystropepts), four subgroups, and seven families. Major
factors contributing to the variability were depth to basaltic boulders or flow
rock, presence or absence of a cambic horizon, amount of organic carbon in the
profile, particle size distribution in the control section, and occurrence in some
pedons of andic properties. Soils all had an oxidic mineralogy class and an
isohyperthennic soil temperature regime. Relationship of the factors affecting
variability to topographic position is discussed, together with an overview of the
physical, chemical, and mineralogical properties of the soils. Similar variability
might be expected in other humid tropical situations on young basaltic
landscapes with steep, rolling, and benched terrain.
Appears in Collections: Pacific Science Volume 46, Number 1, 1992

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