Soil acidity is a major production constraint across agricultural land in Western Australia.
When developing a liming plan for your property, it is important to test more than just the surface as top soil and subsurface soil pH can be quite different. Soil samples should be taken at 0 to 10cm, 10 to 20cm and 20 to 30cm depth to determine a soil pH profile. (Gazey et al., 2014). Sampling sub surface can give you a better picture of just what plant roots are dealing with.
Guessing how much lime to apply from only topsoil samples can lead to inadequate lime application, resulting in too much lime being applied in some areas and too little in others. This can have a big impact on economic efficiency so test your soil pH regularly and adjust your liming rates accordingly.
For further information check out:
Optimising Lime – Three Checks video: https://www.youtube.com/watch?v=0fsuu-y6RKI
GRDC has previously developed a video on soil acidity in Western Australia which gives a great overview of the issue. It can be viewed at: https://www.youtube.com/watch?v=0bUfCwpfBxo
References: Gazey C, Davies S and Master R (2014) Soil acidity: A guide for WA farmers and consultants. Second edition. Bulletin No.4858, Department of Agriculture and Food, Western Australia