St Sapa’ata soils

soil map units where St Sapa’ata soils is dominant

Soil properties

Property Value
Geographic distribution Niuafo’ou
Landscape position From vitric ash on slopes of caldera rim occupying north and west half of the island.
Soil parent material
Slope Flat (0°) to steep (25-30°)
Surface outcrops
Brief soil profile description 0-10 cm Black friable loamy sand; 10-35 cm Dark brown friable loamy sand; 35-75 cm Dark brown friable loam; 75-140 cm Black friable sand.
Soil profile texture
Minimum effective rooting depth 140 cm
Soil pH (acidity) Near neutral
Salinity
Soil fertility under natural conditions Medium cation exchange capacity (CEC) values; moderate topsoil base status except for potassium (K), which is low; medium phosphorus (P) values; sulphur (S) low at surface increasing with depth. Amorphous materials.
Soil moisture regime
Susceptibility to drought
Soil drainage Somewhat excessively drained
Susceptibility to waterlogging
Susceptibility to flooding

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