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 4 benchmarks together — the OptimalRange form drives the primary score, while 3 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
Considering this evidence, a Lower Critical Threshold of pH (CaCl₂) < 5.0 is proposed for agricultural systems in Australian Tropical Monsoonal Savannas.
Lower critical soil pH threshold measured in 0.01M CaCl₂ below which soil health and crop sustainability are compromised.
The pH level below which significant soil health decline and ecological harm occur.
Supported by long-term agricultural trials and literature documenting increased toxicity and nutrient deficiencies below this pH.
Sources (2)
Cotton Production and Sustainability in the Northern Territory: A Comprehensive Analysis of Yield, Soil Properties, and Cover Crops (Mwando et al., 2024, In: Proceedings of the 21st Australian Agronomy Conference)
View Source
General soil science literature and expert synthesis
View Source