Yundi Midslope - Sand over Clay Alternative Fertiliser Trial
This site closely relates to a G3 soil type – Thick sand over clay. These soil types consist sandy topsoil with a bleached A2 horizon overlying a reddish brown or red mottled clay subsoil. They have poor to intermediate structure, and can be dispersive.
Soils pH is acidic at the surface becoming neutral with depth. Rooting depth is to 100cm, with fewer roots occurring below 60cm. Water logging within the clay layer can stunt root growth resulting in low root levels to exploit subsoil moisture Aluminium toxicity can be problematic if pH levels fall further. Nutrient retention capacity may be limited in the sandy surface soil, very low in bleached subsurface layers, and moderate to high in the subsoil. A range of nutrient deficiencies is possible (e.g. potassium, sulphur, zinc, copper and manganese). Chemical accumulations unfavorable to root growth can occur in the subsoil (but often at a depth of >1 m).
Further information on G3 soils can be found on page 194 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 G3 soil type.
Yundi Midslope – Sand over Clay Alternative Fertiliser Trial summed chart
Yundi Midslope – Sand over Clay Alternative Fertiliser Trial stacked chart