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 3 benchmarks together — the OptimalRange form drives the primary score, while 2 guard(s) constrain the result.
Contributing Benchmarks
Evidence & Context
Based on the "Ideal" categories defined in the comprehensive Victorian agricultural guidelines, which are calibrated for achieving 90-95% of potential biomass production, the following ranges are proposed as optimal for sustainable forestry, adjusted for soil texture 22: Sands: 100–150 mg/kg Loams: 120–200 mg/kg Clays: 180–250 mg/kg
Available potassium (Colwell K) in soil for sustainable production
Optimal soil potassium range for sands in Australia's Arid Mountain Ranges & Uplands production forestry, calibrated for 90-95% biomass production.
Victorian agricultural guidelines calibrated for 90-95% biomass production
Sources (1)
Understanding soil tests for pastures
View SourceSupporting Sources (2)
Additional references from the underlying research that informed this benchmark.
Beringer, J., et al. 2022. Carbon and water fluxes over a temperate Eucalyptus forest and a tropical wet/dry savanna in Australia. Agricultural and Forest Meteorology 129(3):151-173.
View Source
Long-term rundown of plant-available potassium in Western Australia requires a re-evaluation of potassium management for grain production: a review - CSIRO PUBLISHING | Crop and Pasture Science, accessed July 24, 2025
View Source