University of Guam, Western Pacific Tropical Research Center - Research for Guam's Future
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Guam

From Soil Testing

Guam Series

 

Soil Classification: Clayey, gibbsitic, nonacid isohyperthermic Lithic Ustorthents.

Description:
The Guam series consists of well drained, moderately rapidly permeable soils that are very shallow to limestone bedrock (5 to 41 cm). These soils are on uplifted plateaus. They formed in sediment overlaying porous coralline limestone. Soil texture of top horizon is gravelly clay loam, cobbly clay loam, or gravelly clay. Content of clay is 35 to 55 percent. The Guam soil covers approximately 24 percent of Guam's total land area.

Suitability: This soil series is poorly suited for commercial and subsistence farming. With proper management, (fertilizers and drip irrigation) most vegetables can be grown throughout the year. It is not suited to commercial production of fruit. It is moderately suited for grazing and homesite development. The main limitations are the very shallow soil depth, droughtiness, and rocks. It can be used for wildlife habitat, watershed and recreational development.

Depth
(cm)

Clay
(%)
Moist
bulk
density
(g/cm3)
pH Organic
matter
(%)
CEC
meq/100g
Extractable
P mg/kg
Extractable
K mg/kg
0-25 35-55
0.60-0.90
7.2 12.5 22.0 20.2 50

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