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 Lower Critical Threshold is estimated to be around 40-50 mg/kg exchangeable K.
Lower critical threshold for exchangeable potassium in the 0-10 cm soil depth
The lower critical threshold below which plant health and productivity are significantly compromised.
Based on agronomic critical values, native ecosystem reference levels, and analogous savanna systems.
Sources (2)
Soil Survey of the Kurnturlpara Area, Warumungu Aboriginal Land Trust
View SourceSupporting Sources (1)
Additional references from the underlying research that informed this benchmark.
Fertilisation with P, N and S requires additional Zn for healthy plantation tree growth on low fertility savanna soils - ResearchGate
View Source