Point Pass Flat – Red Brown Clay Loam over Light Orange Clay
This site closely relates to a D3 soil type – loam over poorly structured red clay. These soil types consist of hard loam over coarsely structured dispersive red clay. D3 soils become more calcareous with depth.
Soils pH is slightly acidic at the surface and strongly alkaline with depth. Rooting depth is to 90cm. The hard setting surface restricts surface root growth. Hard and coarsely structured dispersive subsoil impedes downward root growth. Roots are confined to spaces between coarse soil aggregates and rarely grow into the aggregate. This leads to poor water use efficiency. High pH and sodicity below 40cm further limits root development. The soil surface can seal leading to patchy seedling emergence.
Further information on D3 soils can be found on page 158 of The Soils of Southern South Australia, Part 1 or Part 2.
Detailed representative soil profile data is available for more than 1100 locations around South Australia and can be accessed through Nature Maps, with a handy guide for using data sheets also available. A localised soil characterisation site data sheet provides indicative chemical analysis of a D3 soil type.
Point Pass Flat – Red Brown Clay Loam over Light Orange Clay summed chart
Point Pass Flat – Red Brown Clay Loam over Light Orange Clay stacked chart
Point Pass Flat – Red Brown Clay Loam over Light Orange Clay soil temperature chart