Soil acidification refers to the increasing level of hydrogen ions found within the soil profile.
Increasing soil acidity directly affects the chemical nature of the soil, subsequently affecting the biological communities living within the soil and the soils physical structure. The resulting degradation of the acidifying soil leads to issues such as compaction and an increased pressure from weeds and decreased productivity.
Acidic soils commonly occur throughout the higher rainfall zones on the Eastern Mount Lofty Ranges and the Fleurieu Peninsula however are becoming increasingly common in the South Australian Southern Murray Mallee. Soil acidification in lower rainfall zones is particularly linked with continuous cropping systems. Soil acidification can lead to a decreased variety of suitable cropping and pasture species and subsequent decrease in production outcomes.
See the below link for reports and fact sheets on soil acidity.