Tv Tu’avao soils

soil map units where Tv Tu’avao soils is dominant

Soil properties

Property Value
Geographic distribution Niuatoputapu
Landscape position Form on alluvial materials in south and southwest of island.
Soil parent material
Slope Flat to undulating (0-5°)
Surface outcrops
Brief soil profile description 0-30 cm Very dark grey friable sandy loam; 30-90 cm Very dark greyish brown to dark brown friable sandy loam; >90 cm Yellowish brown firm sandy loam.
Soil profile texture
Minimum effective rooting depth 100 cm
Soil pH (acidity) Slightly alkaline
Soil fertility under natural conditions Organic carbon (C) and nitrogen (N) values low; total phosphorus (P) and phosphorus (P) very high; sulphur (S) medium; Base saturation (%) very high; calcium (Ca) high; potassium (K) and sodium (Na) values medium.
Soil moisture regime
Susceptibility to drought
Soil drainage Somewhat excessively drained
Susceptibility to waterlogging Never Waterlogs
Susceptibility to flooding Never Floods

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