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GRDC_FS_Soil testing for crop nutrition W_low res pdf
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Other measurements that aid the interpretation of soil nutrient tests include soil pH, percentage of gravel in the soil, soil carbon/organic matter content, P sorption capacity [currently measured as Phosphorus Buffering index (PBi)], electrical conductivity, chloride and exchangeable cations (CeC) including aluminium... for canola the critical value measured in the 0 to 10cm soil layer is 44mg K/kg for all soils to achieve 90 per cent of maximum yield... The critical wheat soil S test value measured in the 0 to 30 cm soil layer is 4.6mg S/kg for all soils to achieve 90 per_cent of maximum yield...
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