The trial aimed to address the lack of long-term lime trials taking place in the Albany Port Zone. 

The aim was to evaluate five different lime sources from the southwest to determine were differences in their effect on soil pH and yields. 

There was no significant differences in grian yields resulting form the different lime sources, across any of the years within the trial, regardless of variety.

Soil pH data collected in 2019 show and increase in soil pH for all lime treatments in the topsoil (0-10CM) and 10-20cm, from the original data collection in 2015, at the beginning of the trial. 

Soil pH changes in 20-30cm layer have been negligible compared to the untreated control over six years. 

This trial shows that the addition of lime has improved soil pH to a depth of 20cm. The lack of improvement in grain yields over the nil control indicates that initial soil pH levels at this site were not low enough to be a constrain to grains yields.