Soil Fertility Guidelines

Soil fertility guidelines are used to interpret your soil test results, and to calculate the fertiliser requirements for a pasture. The soil fertility guidelines identify if soil nutrient levels are low, adequate or high in relation to the levels required for optimum pasture production. The optimum soil fertility level for a dairy pasture system is reached when the yield is between 95% and 98% of the maximum potential yield. Beyond this point further application of fertiliser is generally uneconomical. Numerous trials and research results have been used to calibrate soil test values against yield responses and to produce the soil fertility guidelines for each dairy region.

Important: Soil sampling depths and test methods used vary across Australia.


Phosphorus, Potassium and Sulphur

Western Australia





Phosphorus, Potassium, Sulphur and pH


Phosphorus, Potassium and Sulphur

New South Wales

Phosphorus, Potassium and Sulphur

South Australia

Phosphorus, Potassium and Sulphur