Soil pH
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 19 benchmarks together — the OptimalRange form drives the primary score, while 18 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
Lower Critical Threshold: pH(CaCl₂) 4.8 Below this level, the ecological integrity of most improved pasture systems is significantly compromised.
Soil pH measured in calcium chloride solution (pH(CaCl₂)) representing the lower critical threshold below which aluminium toxicity harms pasture health.
The pH(CaCl₂) level below which aluminium toxicity causes root damage and pasture degradation in the Tropical & Subtropical Maritime Islands biome.
Extensive soil science literature identifies pH(CaCl₂) 4.8 as the tipping point for aluminium toxicity and pasture ecosystem degradation.
Sources (1)
VEGETATION 0}' LORD HOWE ISLAND - Botanic Gardens of Sydney
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