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Atate

From Soil Testing

Atate Series

Soil Classification: Very fine, oxidic, isohyperthermic Oxic Haplustalfs.

Description:
The Atate series consists of very deep, moderately permeable, well drained soils on volcanic uplands. These soils formed in residuum derived from tuff and tuff breccia. Depth to bedrock is 102 to 152 centimeters or more. Soil texture of top horizon is clay loam, silty clay loam, silty clay, or clay. Content of clay is 60 to 90 percent. The Atate soil covers approximately 0.7 percent of Guam's total land area.

Suitability: This soil series is moderately suited for subsistence and commercial farming, and homesite development. The main limitations are the hazard of erosion, low soil fertility, soil acidity. Crushed coral limestone can be mixed into the soil to provide calcium and to reduce soil acidity. Compost can be added to improve soil fertility. Crops that can be grown are those adapted to acidic soils, including watermelon, head and Chinese cabbage, and fruit trees. It is well suited to grazing in areas not heavily forested. 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. It can be used for recreational development.

Depth
(cm)

Clay
(%)
Moist
bulk
density
(g/cm3)
pH Organic
matter
(%)
CEC
meq/100g
Extractable
P mg/kg
Extractable
K mg/kg
0-13 40-60
0.90-1.10
5.5 6.0 17.8 0.7 150

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