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 15 benchmarks together — the OptimalRange form drives the primary score, while 14 guard(s) constrain the result.
Evidence & Context
A detrimental upper threshold exists at pH > 7.5, where nutrient imbalances and nitrogen loss become significant.
Soil pH level above which nutrient imbalances and nitrogen loss indicate ecosystem degradation.
Upper critical soil pH threshold indicating ecosystem degradation due to alkalinity.
Based on literature documenting micronutrient deficiencies and nitrogen cycle disruption at high pH levels.
Sources (1)
Soil and plant nutrient concentrations across a tropical forest-sclerophyll vegetation boundary in north-eastern Australia
View SourceSupporting Sources (2)
Additional references from the underlying research that informed this benchmark.
What are the optimum nutrient targets for pastures? - Soil Health Knowledgebase
View SourceGrowing up or growing out? How soil pH and light affect seedling growth of a relictual rainforest tree | AoB PLANTS | Oxford Academic, accessed July 20, 2025,
View Source