Soil Potassium

AUS-ASP-AGR-SOK General Moderate confidence

Benchmark Value

120 mg/kg
Direction: Higher is desirable ↑
Form: Point

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

OptimalRange Primary Point Guard MinimumOnly Guard MaximumOnly Guard Point Guard

Evidence & Context

The following benchmark is derived from a synthesis of the preceding analysis, translating the functional understanding of soil potassium in arid agroecosystems into a single, defensible reference point representing a state of high environmental health.

Metric Definition:

Soil Potassium measured as Colwell K, representing plant-available potassium in soil.

Benchmark Definition:

This benchmark represents a state of high environmental health for soil potassium in arid agroecosystems under agricultural crop production, indicating a robust and well-buffered potassium supply that supports resilient plant growth and drought tolerance.

Justification:

Derived from ecological interpretation of agronomic data and principles of soil health and regenerative agriculture, reflecting a robust, well-buffered potassium supply.

Sources (3)

Preview of (PDF) Soil potassium—crop response calibration relationships and criteria for field crops grown in Australia - ResearchGate, accessed July 18, 2025,
(PDF) Soil potassium—crop response calibration relationships and criteria for field crops grown in Australia - ResearchGate, accessed July 18, 2025, Journal

Nutrient Cycling in Australian Savannas on JSTOR - DOI

View Source
Preview of Crop and Pasture Science - CSIRO PUBLISHING, accessed July 10, 2025
Crop and Pasture Science - CSIRO PUBLISHING, accessed July 10, 2025 Journal

Long-term rundown of plant-available potassium in Western Australia requires a re-evaluation of potassium management for grain production: a review - CSIRO Publishing, accessed July 17, 2025

View Source
Preview of Potassium | Fact Sheets | soilquality.org.au, accessed August 11, 2025,
Potassium | Fact Sheets | soilquality.org.au, accessed August 11, 2025, Government

Potassium | Fact Sheets | soilquality.org.au

View Source

Supporting Sources (28)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Mineral Nutrition of Plants in Australia's Arid Zone - ResearchGate, accessed July 13, 2025
(PDF) Mineral Nutrition of Plants in Australia's Arid Zone - ResearchGate, accessed July 13, 2025
Contextual Support

Putting the P in Ptilotus: a phosphorus-accumulating herb native to Australia - PMC

View Source
Preview of (PDF) World salinization with emphasis on Australia - ResearchGate
(PDF) World salinization with emphasis on Australia - ResearchGate
Contextual Support Journal

Soil salinization in agriculture: Mitigation and adaptation strategies combining nature-based solutions and bioengineering - PMC

View Source
Preview of A Guide To Soil Electrical Conductivity (EC): Description, Importance & Soil EC Maps, accessed July 30, 2025
A Guide To Soil Electrical Conductivity (EC): Description, Importance & Soil EC Maps, accessed July 30, 2025
Contextual Support Journal

Applying Soil Health Indicators to Encourage Sustainable Soil Use: The Transition from Scientific Study to Practical Application - MDPI

View Source
Preview of A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library, accessed August 4, 2025
A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library, accessed August 4, 2025
Contextual Support Journal

A review of the economics of regenerative agriculture in Western Australia - DPIRD's Digital library

View Source
Preview of Healthy Soils for Sustainable Farms | FutureBeef
Healthy Soils for Sustainable Farms | FutureBeef
Contextual Support Journal

Healthy Soils for Sustainable Farms | FutureBeef, accessed August 4, 2025,

View Source
Preview of Impacts of salinity | Environment, land and water - Queensland Government
Impacts of salinity | Environment, land and water - Queensland Government
Contextual Support Government

Impacts of salinity | Environment, land and water - Queensland Government

View Source
Preview of Impacts of salinity | Environment, land and water - Queensland Government, accessed May 13, 2025,
Impacts of salinity | Environment, land and water - Queensland Government, accessed May 13, 2025,
Contextual Support Government

Recommended Measurements for Scaling Soil Health Assessment

View Source
Preview of Living with high potassium: Balance between nutrient acquisition and K-induced salt stress signaling
Living with high potassium: Balance between nutrient acquisition and K-induced salt stress signaling
Contextual Support

Living with high potassium: Balance between nutrient acquisition and K-induced salt stress signaling

View Source
Preview of Long-term rundown of plant-available potassium in Western Australia requires a re-evaluation of potassium management for grain production: a review - BioOne Complete, accessed July 10, 2025
Long-term rundown of plant-available potassium in Western Australia requires a re-evaluation of potassium management for grain production: a review - BioOne Complete, accessed July 10, 2025
Direct Evidence Journal

Long-term rundown of plant-available potassium in Western Australia requires a re-evaluation of potassium management for grain production: a review - BioOne Complete

View Source
Preview of 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 10, 2025
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 10, 2025
Contextual Support Journal

Potassium Control of Plant Functions: Ecological and Agricultural Implications - PMC

View Source
Preview of Plant nutrients in the soil - NSW Department of Primary Industries
Plant nutrients in the soil - NSW Department of Primary Industries
Contextual Support Journal

Plant nutrients in the soil - NSW Department of Primary Industries

View Source
Preview of Plant nutrients in the soil - NSW Department of Primary Industries, accessed July 18, 2025,
Plant nutrients in the soil - NSW Department of Primary Industries, accessed July 18, 2025,
Contextual Support Government

Potassium In Soil Explained - Soil Quality Knowledge Base

View Source
Preview of POTASSIUM - Amazon S3
POTASSIUM - Amazon S3
Contextual Support Journal

Basics of Salinity and Sodicity Effects on Soil Physical Properties

View Source
Preview of Potassium Control of Plant Functions: Ecological and Agricultural Implications - PMC, accessed July 30, 2025,
Potassium Control of Plant Functions: Ecological and Agricultural Implications - PMC, accessed July 30, 2025,
Contextual Support Journal

Regenerative Agriculture - Nuffield Farming Scholarships

View Source
Preview of Potassium In Soil Explained - Soil Quality Knowledge Base, accessed August 11, 2025,
Potassium In Soil Explained - Soil Quality Knowledge Base, accessed August 11, 2025,
Contextual Support GreyLiterature

Healthy soils and soil test interpretation - North Central Catchment Management Authority

View Source
Preview of Potassium Project To Improve Crop Nutrition | Mirage News
Potassium Project To Improve Crop Nutrition | Mirage News
Contextual Support Journal

Potassium Project To Improve Crop Nutrition | Mirage News

View Source
Preview of Recommended Measurements for Scaling Soil Health Assessment, accessed July 28, 2025
Recommended Measurements for Scaling Soil Health Assessment, accessed July 28, 2025
Contextual Support GreyLiterature

A review on effective soil health bio-indicators for ecosystem restoration and sustainability

View Source
Preview of Regenerative Agriculture - a literature review on the practices and mechanisms used to improve soil health - DPIRD's Digital library, accessed August 5, 2025,
Regenerative Agriculture - a literature review on the practices and mechanisms used to improve soil health - DPIRD's Digital library, accessed August 5, 2025,
Contextual Support

Regenerative Agriculture Program restoring soil pH case study: Macdonald, Whites Flat/Koppio

View Source
Preview of Regenerative agriculture - Wikipedia, accessed August 8, 2025
Regenerative agriculture - Wikipedia, accessed August 8, 2025
Contextual Support

Regenerative agriculture - Wikipedia

View Source
Preview of Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025
Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed August 4, 2025
Contextual Support Journal

Regenerative agriculture is key to dry season preparation - Soils For Life, accessed July 23, 2025

View Source
Preview of Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Contextual Support Journal

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed July 20, 2025,

View Source
Preview of Regenerative Potassium Management - Agresol - Regenerative Agriculture Consulting Australia
Regenerative Potassium Management - Agresol - Regenerative Agriculture Consulting Australia
Contextual Support GreyLiterature

Regenerative Potassium Management - Agresol - Regenerative Agriculture Consulting Australia

View Source
Preview of Saline Arid Zone: Definition and Formation - Biology Discussion
Saline Arid Zone: Definition and Formation - Biology Discussion
Contextual Support Journal

Saline Arid Zone: Definition and Formation - Biology Discussion

View Source
Preview of Soil K rundown in the Western grains region – where, why and what does it mean for crop yields? - GRDC, accessed July 13, 2025
Soil K rundown in the Western grains region – where, why and what does it mean for crop yields? - GRDC, accessed July 13, 2025
Direct Evidence GreyLiterature

Soil K rundown in the Western grains region – where, why and what does it mean for crop yields? - GRDC

View Source
Preview of Subsoil testing required to detect the rundown of soil potassium to deficient levels for wheat production on loam-textured soils - CSIRO Publishing
Subsoil testing required to detect the rundown of soil potassium to deficient levels for wheat production on loam-textured soils - CSIRO Publishing
Direct Evidence

Potassium rundown in grain cropping and the emergence of potassium deficiency on loamy soils - Agronomy Australia Proceedings

View Source
Preview of The dirt on our soils - Curious - Australian Academy of Science, accessed July 13, 2025
The dirt on our soils - Curious - Australian Academy of Science, accessed July 13, 2025
Contextual Support GreyLiterature

The dirt on our soils - Curious - Australian Academy of Science

View Source
Preview of Under the radar: Potassium on loamy soil - SoilsWest
Under the radar: Potassium on loamy soil - SoilsWest
Contextual Support GreyLiterature

Under the radar: Potassium on loamy soil - SoilsWest

View Source
Preview of Understanding soil tests for pastures | Soil | Farm management ..., accessed May 12, 2025
Understanding soil tests for pastures | Soil | Farm management ..., accessed May 12, 2025
Contextual Support Government

Agriculture Victoria. (2025). Understanding soil tests for pastures. Farm Management.

View Source

Context

  • Region Australia
  • Biome Arid Shrublands & Stony Plains
  • Land Use Agricultural Crop Production
  • Assessment Conservation Target
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 8 Jun 2026

Notes

Lower Critical Threshold: 50 mg/kg. Optimal range: 80-150 mg/kg. Upper Detrimental Threshold: 250 mg/kg indicating risk of cation imbalance and salinity stress.