Soil Potassium

Benchmark Value

80 mg/kg

Thresholds: Lower: 80, Upper: —

Direction: Higher is desirable ↑

Form: LowerThreshold

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 the "Low" categories provided in soil fertility guides, the following lower critical thresholds are proposed: For Sandy Loams: < 80 mg/kg

Metric Definition:

Colwell K soil potassium concentration in mg/kg

Benchmark Definition:

This benchmark represents the lower critical threshold of soil potassium concentration in sandy loam soils below which ecosystem function is impaired under livestock grazing and pasture in temperate dry woodlands and native grasslands in Australia.

Justification:

Soil potassium levels below this threshold likely lead to deficiency symptoms and ecological harm in sandy loam soils.