Soil Potassium

Benchmark Value

No specific value — see range

Range: 161 to 250 mg/kg

Optimal Range: 161 to 250

Direction: Higher is desirable ↑

Form: OptimalRange

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 3 benchmarks together — the OptimalRange form drives the primary score, while 2 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary LowerThreshold Guard UpperThreshold Guard

Evidence & Context

Based on this interpretative approach, the following reference ranges for Colwell K are proposed: For Clay Loams: 161-250 mg/kg

Metric Definition:

Colwell K soil potassium concentration in mg/kg

Benchmark Definition:

This benchmark represents the optimal range of soil potassium concentration in clay loam soils under livestock grazing and pasture in temperate dry woodlands and native grasslands in Australia.

Justification:

This range is derived from the "Ideal" category provided by Agriculture Victoria and the "Adequate" range from the Corangamite CMA Soil Health Knowledge Base, interpreted for native ecosystems under sustainable grazing.