Coomandook Flat – Loam over Calcrete Rubble

This site closely relates to a B2a soil type – grey calcareous sandy loam on calcrete. These soil types consist of a calcareous greyish brown sandy loam at the surface, becoming more clayed and highly calcareous in the subsurface. There is a rubbly calcrete layer at a moderately shallow depth.

Soils pH at the surface is alkaline, and strongly alkaline at depth. Rooting depth is limited to approximately 50 – 60cm and determined by the depth of the calcrete layer. The calcrete layer impedes root growth with the high pH level below the calcrete level restricting deeper root establishment. The high carbonate level throughout reduces nutrient availability.

Further information on B2 soils can be found on page 120 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 B2a soil type.

Coomandook Flat – Loam over Calcrete Rubble summed chart

Coomandook Flat – Loam over Calcrete Rubble summed chart

Coomandook Flat – Loam over Calcrete Rubble stacked chart

Coomandook Flat – Loam over Calcrete Rubble stacked chart

Coomandook Flat – Loam over Calcrete Rubble soil temperature chart

Coomandook Flat – Loam over Calcrete Rubble soil temperature chart