Soil Potassium
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 5 benchmarks together — the OptimalRange form drives the primary score, while 4 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
A benchmark of 80 mg/kg (Colwell K) has been derived with Moderate confidence. This value was determined by synthesizing multiple lines of evidence: using agronomic critical values to establish a functional floor, referencing national soil models to estimate a natural baseline, and applying ecological principles relevant to these unique, low-nutrient, arid ecosystems.
Available soil potassium concentration measured as Colwell K, representing the level of potassium available for plant uptake in soil.
Available soil potassium concentration representing the ecosystem's potassium status in a high environmental health state in Arid Karstic Woodlands & Shrublands under conservation management.
Derived through synthesis of multiple indirect lines of evidence including agronomic studies, national soil models, and ecological principles due to lack of direct measurements.
Sources (1)
"Soil Groups of Western Australia"
View SourceSupporting Sources (3)
Additional references from the underlying research that informed this benchmark.
Putting the P in Ptilotus: a phosphorus-accumulating herb native to Australia - PMC
View Source
Agronomic and ecological studies on potassium excess effects
View SourceEcological literature on nutrient adaptation in arid ecosystems
View Source