The reason for using only the aspect of presence and absence of pedality
as a grouping criterion was that further details of descriptive soil structural information, such as the degree of soil structural development and the shape and size of soil structural units (i.
Distinct zones of morphological properties (texture, pedality
, colour, coarse fragment content) can be described using the key.
Soil water retention properties were calculated for each soil, based on estimates of texture, bulk density, and pedality
made from the CSIRO National Soil Profile Database and the pedo-transfer approach.
1983) noted that the presence of pedality
, particle size composition and the grade of structure were most consistently associated with differences in [psi]([theta]), while field texture and the presence of montmorillonite, vermiculite, iron oxide, and quartz were also associated with form and position of the [psi]([theta]).
Highly developed soil features occur throughout the 3 parna layers, particularly the 2 older ones, such as significant pedality
, distinctive cutans on ped faces, Fe-Mn oxide and carbonate nodules.
occurs where large peds separate along natural planes of weakness to form smaller peds, which may again part to smaller peds, and so on to the smallest or primary peds.