Sour soil is what you get when soil contains a lot of organic material and is over watered. When this happens you will see the results in the growth of the lawn. It starts to turn yellow and stops growing.
Sour soil is extremely acidic, and will not support plant growth. The remedy is to correct the cause of the problem and then to treat the soil with chemicals to increase its pH. See our products range to correct sour soil.
The alternative to chemical treatment is to remove the sour soil and replace with healthy soil.
Sour (acidic) soil tends to encourage the growth of moss, so moss is a good indication that there is something wrong.
See soil testing for more information.