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GRDC_FS_Soil testing for crop nutrition N_low res pdf
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KEY poiNtS A range of soil test values used to determine if a nutrient is deficient or adequate is termed a critical range... recent research has highlighted that nitrogen applications can be wasted, even on cropping soils that have low n availability, if the levels of other nutrients such as potassium (K), phosphorus (P) and sulfur (S) are not adequate... The critical wheat soil S test value measured in the 0 to 30cm soil layer is 4.6 (4 to 5.3) mgS/kg for all soils to achieve 90 per_cent of maximum yield...
Broadacre Field Crops DAFF QLD