Aluminium in soil can become harmful in acidic conditions. This study looked at how soil acidity and salinity affect the movement of aluminium in soil samples from Sri Lanka. Samples from different locations were tested for factors like pH, organic matter, and aluminium concentration. The results showed that as soil pH decreases, the amount of mobile aluminium increases, especially when the pH is below 4.0. There was no clear link between total aluminium and mobile aluminium in the soil. This suggests that soil acidity plays a significant role in the release of mobile aluminium, which can have negative effects on living organisms.