Published by Australian Academy of Science
Useful sites | Sodicity – a dirty word in Australia

Soils and their conservation (University of Adelaide, Australia)

This site includes general information about soils. Click on 'What are soils good for?' and then 'Issues' to find out more about erosion, salinity, acidity, pollution and fertility. The salinity issue includes information about sodicity.
http://www.adelaide.edu.au/agcareers/Content/content-framesets/TeacherResources.html

Managing sodic soils (Colorado State University Cooperative Extention, USA)

Describes sodic soils and how to manage them.
http://www.ext.colostate.edu/pubs/crops/00504.html

Salinity and sodicity in North Dakota (North Dakota State University, USA)

Describes the related problems of salinity and sodicity. Some explanations use technical language and the areas discussed are in the USA but this site contains good information.
http://www.ext.nodak.edu/extpubs/plantsci/soilfert/eb57-1.htm

The Australian Soil Classification: How to use this classification (CSIRO Division of Land and Water)

Explains the features used to classify soils. Sodic soils are dealt with in detail in the sodosol order. The detailed descriptions use technical language.
http://www.clw.csiro.au/aclep/asc_re_on_line/soiusing.htm

The salinity audit of the Murray-Darling Basin (Murray-Darling Basin Commission)

Both the full report and a summary of the salinity audit are available as PDF files. Also of interest is Water and land salinity, which gives a good coverage of these problems in the Murray-Darling Basin.
http://www.mdbc.gov.au/salinity/salinity_audit_1999/