Soil Chemistry Overview

This data reflects both the natural elemental composition at the site and the historical influence of nutrient management. Some soil properties such as organic carbon indicate overall soil health, whilst other such as Sodicity, Aluminium and salinity may indicate constraints to root growth and soil water extraction. Comparison between sites of the same soil type will help better understand the difference between these two influencing factors. High or low levels of some nutrients may indicate that some changes in nutrient management may be necessary and we suggest that you contact your local agronomist for their recommendations.

The A1 horizon is neutral at 6.6 _h20 , trending towards slightly acid in the B21 horizon, and strongly acid in the subsoil B22 horizons. Organic carbon in the A1 is very high at 3.75 % and very low in the B21 and extremely low in the B22 horizons. This decline in soil carbon with depth is not unexpected. The cation exchange capacity throughout soil profile is very low, ranging from 4.78 meq/100g in the A1 horizon to 2.03 meq/100g in the B22 horizon. This indicates the soil has limited ability to retain and supply nutrients and fertilizer. Although exchangeable aluminium was not measured, the low pH in the B2 subsoils indicates that aluminium toxicity in the subsoil is likely. The soil profile is not saline, and technically not sodic. However, the ESP of the B22 horizon at 5.42 % is close to the sodicity threshold of 6 %.