La1R Lapaha soils, rolling phase

soil map units where La1R Lapaha soils, rolling phase is dominant

Soil properties

Property Value
Geographic distribution Tongatapu
Landscape position Uplifted and ash- mantled coral surface.
Soil parent material -
Slope Gently undulating to rolling slopes (3-12°)
Surface outcrops -
Brief soil profile description 0-30 cm Dark brown friable clay; 30-76 cm Brown firm, heavy clay; 76-99 cm Brown firm, heavy clay;on Coral limestone.
Soil profile texture -
Minimum effective rooting depth 100 cm
Soil pH (acidity) Moderately alkaline to near neutral
Salinity -
Soil fertility under natural conditions High to very high Base saturation (%) and exchangeable calcium (Ca) and magnesium (Mg); phosphorus (P) very high becoming low with depth; sulphur (S) low in A horizons increasing to high with depth.
Soil moisture regime -
Susceptibility to drought -
Soil drainage Well drained
Susceptibility to waterlogging Slight limitations of slow subsoil permeability leading to poor aeration after heavy rain.
Susceptibility to flooding -

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