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.
Evidence & Context
A Lower Critical Threshold (LCT) tentatively proposed at < 70 mg/kg (Colwell K or equivalent) for Alpine Humus Soils.
available K (Colwell K or equivalent extractable K)
This benchmark defines a tentative lower critical threshold for available soil potassium in Alpine Humus Soils, below which ecological functions and long-term productivity are likely compromised.
Set above typical agronomic minimums to buffer against alpine stresses and support broader ecological functions (e.g., plant vigour, OM inputs).
Sources (2)
openresearch-repository.anu.edu.au, accessed on May 31, 2025,
View SourcePhosphorus Nutrition of Proteaceae in Severely Phosphorus-Impoverished Soils: Are There Lessons To Be Learned for Future Crops? - PubMed Central
View SourceSupporting Sources (11)
Additional references from the underlying research that informed this benchmark.
2
Agriculture Victoria guidelines, Tasmania dairy pasture studies, Western Australia pasture studies
S14
S14, 2
S31
S32
S9
S9, S31, S32
Western Australia pasture studies