Soil Electrical Conductivity (EC)

AUS-AMR-FOR-SEC General Moderate confidence

Benchmark Value

0.1 dS/m
Direction: Lower is desirable ↓
Form: MinimumOnly

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 12 benchmarks together — the OptimalRange form drives the primary score, while 11 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary UpperThreshold Guard MaximumOnly Guard MinimumOnly Guard OptimalRange Guard MinimumOnly Guard MaximumOnly Guard MaximumOnly Guard OptimalRange Guard MinimumOnly Guard OptimalRange Guard MaximumOnly Guard

Evidence & Context

Therefore, the lower critical threshold for Soil EC in this context is proposed as: < 0.1 dS/m (measured as ECe​) Below this level, it is highly probable that the soil is critically deficient in the soluble base cations and other nutrients necessary to maintain long-term forest health, vitality, and productive capacity, even for species adapted to low-fertility environments.

Metric Definition:

Electrical conductivity of the saturated paste extract (ECe​) indicating critical nutrient deficiency

Benchmark Definition:

This benchmark defines the lower critical soil electrical conductivity threshold below which soils are likely critically nutrient-deficient for long-term forest health in production forestry of Australia's Arid Mountain Ranges & Uplands.

Justification:

Based on field measurements from a healthy, non-saline eucalypt system showing a minimum EC value of 0.11 dS/m, values significantly below this imply extreme nutrient depletion.

Sources (1)

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Using Soil and Foliar Analysis to Diagnose the Nutritional Status of Urban Trees Journal

Using Soil and Foliar Analysis to Diagnose the Nutritional Status of Urban Trees

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Supporting Sources (32)

Additional references from the underlying research that informed this benchmark.

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(PDF) The Extraordinary Nature of the Great Western Woodlands - ResearchGate, accessed July 10, 2025,
Contextual Support

(PDF) The Extraordinary Nature of the Great Western Woodlands - ResearchGate

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A Biodiversity and Cultural Conservation Strategy for the Great Western Woodlands - DBCA Library, accessed July 15, 2025

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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

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Australia's Framework of Criteria and Indicators - DAFF, accessed July 12, 2025,
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Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 2, 2025,
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Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 5, 2025,
Contextual Support Journal

How should we manage our soils to increase soil carbon?, accessed May 10, 2026

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Preview of Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed July 30, 2025
Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed July 30, 2025
Contextual Support Journal

Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed July 30, 2025

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Preview of Australian Soil: Definition, Classification, Types and Quality - Access EP, accessed July 30, 2025
Australian Soil: Definition, Classification, Types and Quality - Access EP, accessed July 30, 2025
Contextual Support GreyLiterature

Appendix H - Water Infiltration Modelling - NT EPA, accessed July 16, 2025,

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Categories - Electrical Conductivity - CSIRO Data Access Portal, accessed July 30, 2025
Contextual Support Government

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Climate of South Australia - Britannica, accessed July 22, 2025,
Contextual Support GreyLiterature

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Effect of NaCl on emergence and growth of a range of provenances of Eucalyptus citriodora, Eucalyptus populnea, Eucalyptus camaldulensis and Acacia salicina - ResearchGate, accessed July 11, 2025,
Contextual Support GreyLiterature

Effect of NaCl on emergence and growth of a range of provenances of Eucalyptus citriodora, Eucalyptus populnea, Eucalyptus camaldulensis and Acacia salicina - ResearchGate, accessed July 11, 2025

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Effect of soil salinity on growth of irrigated plantation Eucalyptus in ...
Contextual Support Journal

Effect of soil salinity on growth of irrigated plantation Eucalyptus in ...

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Effect of Soil Water on Apparent Soil Electrical Conductivity and Texture Relationships in a Dryland Field - USDA ARS, accessed July 11, 2025,
Methodology Source Journal

Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed July 11, 2025

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Preview of Full article: Effects of Eucalyptus species plantations and crop land on selected soil properties - Taylor & Francis Online, accessed July 30, 2025
Full article: Effects of Eucalyptus species plantations and crop land on selected soil properties - Taylor & Francis Online, accessed July 30, 2025
Contextual Support Journal

Full article: Effects of Eucalyptus species plantations and crop land on selected soil properties - Taylor & Francis Online, accessed July 30, 2025

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Great Western Woodlands - Wikipedia, accessed July 10, 2025,
Contextual Support GreyLiterature

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How Can Soil Electrical Conductivity Measurements Control Soil Pollution? - ResearchGate, accessed July 30, 2025
Methodology Source Journal

How Can Soil Electrical Conductivity Measurements Control Soil Pollution? - ResearchGate, accessed July 30, 2025

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Mapping the impact of subsoil constraints on soil available water capacity and potential crop yield - CSIRO Publishing, accessed July 30, 2025
Contextual Support Journal

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Modeling the electrical conductivity relationship between saturated paste extract and 1:2.5 dilution in different soil textural classes - Frontiers, accessed July 30, 2025
Methodology Source Journal

Modeling the electrical conductivity relationship between saturated paste extract and 1:2.5 dilution in different soil textural classes - Frontiers, accessed July 30, 2025

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NORTHERN FLINDERS RANGES - Department for Environment and Water, accessed July 30, 2025
Contextual Support Journal

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Preview of NSW Department of Planning, Industry and Environment. (2021). Soil health and stability monitoring in forests: Background and review of potential indicators.
NSW Department of Planning, Industry and Environment. (2021). Soil health and stability monitoring in forests: Background and review of potential indicators.
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Production functions of eucalyptus for the design of saline-drainage water reuse systems - USDA ARS, accessed July 11, 2025,
Contextual Support Journal

Production functions of eucalyptus for the design of saline-drainage water reuse systems - USDA ARS, accessed July 11, 2025

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Preview of Relating apparent electrical conductivity to soil properties across the North-Central USA, accessed July 30, 2025
Relating apparent electrical conductivity to soil properties across the North-Central USA, accessed July 30, 2025
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Relating apparent electrical conductivity to soil properties across the North-Central USA, accessed July 30, 2025

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Soil | Australia state of the environment 2021, accessed July 30, 2025
Contextual Support Journal

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Preview of Soil electrical conductivity (EC) is a measure of the amount ... - USDA
Soil electrical conductivity (EC) is a measure of the amount ... - USDA
Contextual Support Journal

Regenerative Agriculture - NSW Department of Primary Industries

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Preview of Soil electrical conductivity: The complete guide to measurements - METER Group, accessed July 30, 2025
Soil electrical conductivity: The complete guide to measurements - METER Group, accessed July 30, 2025
Methodology Source GreyLiterature

Using Soil Electrical Conductivity (EC) to Delineate Field Variation | Ohioline, accessed July 30, 2025

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Preview of Soil health assessment of forest soils [Chapter 6] - Forest Service, accessed July 30, 2025
Soil health assessment of forest soils [Chapter 6] - Forest Service, accessed July 30, 2025
Contextual Support Journal

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Soil management guides - NSW Department of Primary Industries, accessed July 11, 2025,
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Preview of soil survey standard test method electrical conductivity, accessed July 20, 2025,
soil survey standard test method electrical conductivity, accessed July 20, 2025,
Methodology Source

Predicting ECe of the saturated paste extract from value of EC1:5 - Canadian Science Publishing, accessed July 30, 2025

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Preview of soil survey standard test method electrical conductivity, accessed July 30, 2025
soil survey standard test method electrical conductivity, accessed July 30, 2025
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soil survey standard test method electrical conductivity, accessed July 30, 2025

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Preview of The effect of eucalypts camaldulensis on soil properties and fertility
The effect of eucalypts camaldulensis on soil properties and fertility
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The effect of eucalypts camaldulensis on soil properties and fertility

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Preview of The effect of eucalypts camaldulensis on soil properties and fertility - CiteSeerX, accessed July 30, 2025
The effect of eucalypts camaldulensis on soil properties and fertility - CiteSeerX, accessed July 30, 2025
Contextual Support Government

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Preview of Vegetation - Plant communities as salinity indicators - Queensland Government publications, accessed July 30, 2025
Vegetation - Plant communities as salinity indicators - Queensland Government publications, accessed July 30, 2025
Contextual Support Journal

Vegetation - Plant communities as salinity indicators - Queensland Government publications, accessed July 30, 2025

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Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Production Forestry
  • Assessment Not Stated
  • Evidence Type DegradationThreshold

Lifecycle

  • Status Active
  • Version 1
  • Effective From 7 Jun 2026

Notes

Below 0.1 dS/m, soils are likely critically deficient in soluble nutrients necessary to sustain a healthy and resilient forest ecosystem. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AMR-FOR-SEC family.

4 dS/m Moderate
Production Forestry · Not Stated
MaximumOnly Active v2
— dS/m Moderate
Production Forestry · Not Stated
OptimalRange Active v1
0.5 dS/m Moderate
Production Forestry · Not Stated
MaximumOnly Active v1