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
A soil pH(CaCl₂) consistently above 7.0-7.5 may begin to indicate conditions that are less optimal for the typical suite of native flora and could lead to nutrient imbalances or other subtle ecological shifts.
Upper detrimental threshold for soil pH beyond which ecological health may decline.
This benchmark defines the upper detrimental soil pH threshold beyond which ecosystem function may be impaired due to nutrient imbalances and shifts in native plant communities.
Above this pH, nutrient imbalances and shifts in native plant community composition may occur.
Sources (1)
Working with bio-amendments: Insights from cropping farmers - Soils For Life, accessed July 7, 2025,
View SourceSupporting Sources (3)
Additional references from the underlying research that informed this benchmark.
Soil acidity | Soil | Farm management - Agriculture Victoria, accessed August 28, 2025
View SourceSoil acidity - Department for Environment and Water, accessed July 30, 2025,
View SourceProber, S. M., Lunt, I. D., & Thiele, K. R. (2002). Determining reference conditions for management and restoration of temperate grassy woodlands: relationships among trees, topsoils and understorey flora in little-grazed remnants. Australian Journal of Botany, 50(6), 687–697.
View Source