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From Soil Testing

Inarajan Series


Soil Classification: Very-fine, mixed, nonacid, isohyperthermic Aeric Tropic Fluvaquents.

The Inarajan series consists of deep and very deep, somewhat poorly drained, slowly permeable soils on broad valley bottoms and coastal plains. These soils form in alluvium. Depth to bedrock is dominantly more 152 centimeters, but in some areas it is 102 centimeters. Soil texture of top horizon is dominantly clay or silty clay, but it ranges to sandy clay loam in some areas. Content of clay is 45 to 80 percent. The Inarajan soil covers approximately 2.9 percent of Guam's total land area.

Suitability: This soil series is moderately suited to subsistence and commercial farming and grazing. It is poorly suited to homesite development. The main limitations are wetness during the rainy season and lack of water during the dry season. It is well suited to taro and other crops that tolerate seasonal wetness. Most vegetables cannot be grown during the rainy season. Banana, tangerine, and other fruit trees can be grown only on the natural levees along the rivers and on the colluvial valley edges. It can be used for watershed, wildlife habitat, and recreational development. The use of this soil series as wildlife habitat and watershed can be enhanced by preserving the plant cover and protecting seasonal ponds from pollutants.


pH Organic
P mg/kg
K mg/kg
0-25 45-80
6.2 6.0 37.7 5.6 140

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