La2 Lapaha soils, low-lying phase

soil map units where La2 Lapaha soils, low-lying phase is dominant

Soil properties

Property Value
Geographic distribution Tongatapu
Landscape position Uplifted and ash- mantled coral surface.
Soil parent material
Slope Flat to gently undulating slopes (0-3°)
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
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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