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 2 benchmarks together — the OptimalRange form drives the primary score, while 1 guard(s) constrain the result.
Contributing Benchmarks
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
Colwell K soil potassium concentration in mg/kg
Lower critical threshold below which potassium deficiency compromises ecosystem health in sandy loam soils.
Derived from 'Low' category soil fertility guides indicating deficiency symptoms and ecosystem impact.
Sources (1)
Understanding soil tests for pastures | Soil | Farm management ...
View SourceSupporting Sources (3)
Additional references from the underlying research that informed this benchmark.
Do regenerative grazing management practices improve vegetation and soil health in grazed rangelands? Preliminary insights from a space-for-time study in the Great Barrier Reef catchments, Australia - CSIRO Publishing, accessed July 17, 2025
View SourceAgriculture Victoria. (2025). Understanding soil tests for pastures. Farm Management.
View Sourcewww.act.gov.au, accessed May 11, 2025
View Source