N1 Nomuka soils

soil map units where N1 Nomuka soils is dominant

Soil properties

Property Value
Geographic distribution Ha’apai
Landscape position Young ash on slopes in the centre of Nomuka Island.
Soil parent material
Slope Gently undulating (3°) slopes
Surface outcrops
Brief soil profile description 0-15 cm Dark reddish brown friable clay; 15-70 cm Dark reddish brown firm to friable clay with lapilli; on Older ash at 100 cm.
Soil profile texture
Minimum effective rooting depth 100 cm
Soil pH (acidity) Slightly acid
Soil fertility under natural conditions Organic carbon (C) and nitrogen (N) values are low to medium in topsoil; phosphorus (P) low and phosphorus (P) retention are high to medium; Base saturation (%) and cation exchange capacity (CEC) values high; sulphur (S) low.
Soil moisture regime
Susceptibility to drought
Soil drainage Well drained
Susceptibility to waterlogging
Susceptibility to flooding

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