Pallic Soils [P]
A cubic metre of some subsoils can weigh more than 1.8 tonnes.
Pallic Soils have pale coloured subsoils, due to low contents of iron oxides. The soils have weak structure and high density in subsurface horizons. Pallic Soils are dry in summer and wet in winter
Pallic Soils occur predominantly in the seasonally dry eastern part of the North and South Islands, and in the Manawatu. Parent materials are commonly loess derived from schist or greywacke. They cover 12% of New Zealand.
Soils have slow permeability with limited rooting depth, and medium to high bulk density. They are susceptible to erosion because of high potential for slaking and dispersion.
Soils have medium to high nutrient content ( except for sulphur), high base saturation, low concentrations of secondary oxides, and low organic matter contents.
Soil orders are divided into soil groups based on variation in factors such as drainage status, parent material, chemical and physical properties