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Agfayan

From Soil Testing

Agfayan Series

 

Soil Classification: Clayey, montmorillonitic, isohyperthermic, shallow Udic Haplustolls.

Description:
The Agfayan series consists of well drained, moderately slowly permeable soils that are very shallow and shallow to strongly weathered tuff. These soils are on volcanic uplands. They formed in residuum derived from marine-deposited tuff, tuff breccia, and tuffaceous sandstone. Depth to bedrock is 10 to 38 centimeters. Soil texture of top horizon is clay. Content of clay is 60 to 80 percent. The Agfayan soil covers approximately 0.8 percent of Guam's total land area.

Suitability: This soil series is not suited to commercial farming and poorly suited to subsistence farming, and homesite development. The main limitations are the depth to impermeable bedrock, the hazard of erosion, and the lack of water during the dry season, and steep slopes. It is moderately suited to grazing. The use of this soil series as wildlife habitat and watershed can be enhanced by protecting the soil from wildfires and by planting adapted trees.

Depth
(cm)

Clay
(%)
Moist
bulk
density
(g/cm3)
pH Organic
matter
(%)
CEC
meq/100g
Extractable
P mg/kg
Extractable
K mg/kg
0-10 60-80
0.80-0.95
6.7 3.5 -- -- --


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