How to Interpret Results
Soil testing is a tool to assess the amount of plant available nutrients in the soil. A tool to identify limitations to production, which can include pH, soil structure, sodicity, salinity, low nutritional status or excessive nutritional status.

The interpretation of soil test data will be based on crop yields, stocking rates and production targets. Taking into account the nutritional status of the soil, ranges are generally based around the critical value required, which determines the value where 90-95% of maximum production or yield potential occurs. The confidence interval around the critical value indicates the reliability of the estimate, the narrower the range the more reliable the data. This data has being collated from fertiliser trials, where various fertiliser rates are applied and the crop yield response measured. Adequate levels are generally higher than the critical value to allow for field error and natural variation.

The below document outlines interpretation data based on published research and the Eurofins APAL database. Compiled from experience and observations from over 15 years of data and including input from local experts and agronomists in the field.

For any further information please contact Eurofins APAL on 08 8332 0199 or


The full Soil Test Interpretation Guide discusses the available soil tests, their methods, ranges and interpretation of results, and is available for download below.

Soil Test Interpretation Guide

Updated version coming soon, please contact office for information.

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