Soil Phosphorus
Benchmark Value
Scoring Curve
This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context. The scoring engine uses 2 benchmarks together — the OptimalRange form drives the primary score, while 1 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
Industry guidelines provide well-established minimums for maintaining pasture productivity. For the Colwell P test, these minimums vary with PBI, ranging from 10 mg/kg for very low PBI soils (sands) to 60 mg/kg for very high PBI soils (clays).
Available phosphorus (Colwell-P) concentration in soil
This benchmark represents the lower critical threshold of available phosphorus in soil needed to maintain productive function in temperate semi-arid grazing systems with low PBI soils (sands).
These values represent a robust, evidence-based lower critical threshold for the productive function of the grazing system.
Sources (2)
Soil nutrient critical limits | MBFP | More Beef from Pastures - MLA
View SourceCritical phosphorus values from the Better Fertiliser Decisions for Pastures project: early insights from validation trials - CSIRO Publishing
View SourceSupporting Sources (2)
Additional references from the underlying research that informed this benchmark.
Phosphorus - NSW | Fact Sheets | soilquality.org.au, accessed July 22, 2025
View SourceIndicative Soil Phosphorus Report | LongPaddock | Queensland Government
View Source