Soil Structure & Compaction

AUS-AMR-CON-SSC General Moderate confidence

Benchmark Value

500 kPa
Direction: Higher is desirable ↑
Form: MaximumOnly

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 6 benchmarks together — the OptimalRange form drives the primary score, while 5 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

Analysis of widely accepted diagnostic criteria indicates that this state is best represented by a penetrometer resistance value of less than 500 kPa, measured under standardized soil moisture conditions (field capacity).

Metric Definition:

Penetrometer resistance value representing soil compaction measured under standardized soil moisture conditions (field capacity).

Benchmark Definition:

The benchmark is defined as a penetrometer resistance value measured at field capacity indicating minimal soil compaction that does not impede root growth or water infiltration.

Justification:

This benchmark is a derived value representing the best available condition for soil structure in protected arid uplands, based on established functional thresholds where penetrometer resistance values < 500 kPa are considered 'Not Compacted' and pose no significant mechanical impedance to root growth or water infiltration.

Sources (1)

Preview of Deriving a soil compaction benchmark for Australian arid uplands from root growth limitation principles (Synthesis Report)
Deriving a soil compaction benchmark for Australian arid uplands from root growth limitation principles (Synthesis Report) Government

GROWTH-LIMITING SOIL BULK DENSITIES AS INFLUENCED BY ..., accessed August 2, 2025,

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Supporting Sources (29)

Additional references from the underlying research that informed this benchmark.

Preview of (PDF) Mapping soil compaction measuring cone penetrometer resistance - ResearchGate, accessed August 2, 2025,
(PDF) Mapping soil compaction measuring cone penetrometer resistance - ResearchGate, accessed August 2, 2025,
Methodology Source GreyLiterature

(PDF) Mapping soil compaction measuring cone penetrometer resistance - ResearchGate, accessed August 2, 2025,

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Preview of (PDF) Soil Physical Properties - ResearchGate, accessed August 2, 2025,
(PDF) Soil Physical Properties - ResearchGate, accessed August 2, 2025,
Contextual Support GreyLiterature

(PDF) Soil Physical Properties - ResearchGate, accessed August 2, 2025,

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Preview of 1885-1890 - Stability in rangelands: ecology and economics - UKnowledge, accessed July 24, 2025
1885-1890 - Stability in rangelands: ecology and economics - UKnowledge, accessed July 24, 2025
Contextual Support

1885-1890 - Stability in rangelands: ecology and economics - UKnowledge, accessed July 24, 2025,

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Preview of A BIOLOGICAL SURVEY OF THE FLINDERS RANGES SOUTH AUSTRALIA - Enviro Data SA
A BIOLOGICAL SURVEY OF THE FLINDERS RANGES SOUTH AUSTRALIA - Enviro Data SA
Contextual Support Journal

A BIOLOGICAL SURVEY OF THE FLINDERS RANGES SOUTH AUSTRALIA - Enviro Data SA, accessed July 31, 2025

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Preview of A DYNAMIC CONE PENETROMETER FOR MEASURING SOIL PENETRATION RESISTANCE - USDA ARS, accessed August 2, 2025,
A DYNAMIC CONE PENETROMETER FOR MEASURING SOIL PENETRATION RESISTANCE - USDA ARS, accessed August 2, 2025,
Methodology Source Journal

A DYNAMIC CONE PENETROMETER FOR MEASURING SOIL PENETRATION RESISTANCE - USDA ARS, accessed August 2, 2025,

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Preview of Arid Recovery - Homepage, accessed August 2, 2025,
Arid Recovery - Homepage, accessed August 2, 2025,
Contextual Support Journal

Arid Recovery - Homepage, accessed August 2, 2025,

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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 August 2, 2025,
Australian dryland soils are acidic and nutrient-depleted, and have unique microbial communities compared with other drylands - PMC, accessed August 2, 2025,
Contextual Support Government

Northern and Yorke | Soil management - Landscape South Australia, accessed July 28, 2025

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Preview of Australian National Soil Archive - CSIRO, accessed July 30, 2025,
Australian National Soil Archive - CSIRO, accessed July 30, 2025,
Contextual Support Government

Australian National Soil Archive - CSIRO, accessed May 15, 2025

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Preview of Brachina Gorge Geological Trail - Flinders Ranges Field Naturalists •, accessed August 2, 2025,
Brachina Gorge Geological Trail - Flinders Ranges Field Naturalists •, accessed August 2, 2025,
Contextual Support Journal

Geological setting of exceptional geological features of the Flinders Ranges - ResearchGate, accessed August 2, 2025,

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Preview of Ch 6. Soil Degradation: Erosion, Compaction, and Contamination - SARE, accessed August 2, 2025,
Ch 6. Soil Degradation: Erosion, Compaction, and Contamination - SARE, accessed August 2, 2025,
Contextual Support GreyLiterature

Ch 6. Soil Degradation: Erosion, Compaction, and Contamination - SARE

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Preview of Compaction | VRO - Victorian Resources Online, accessed August 4, 2025,
Compaction | VRO - Victorian Resources Online, accessed August 4, 2025,
Contextual Support

3- Build and maintain soil nutrients to improve soil fertility and health in all pasture zones

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Preview of Diagnosing Soil Compaction Using a Penetrometer (soil compaction tester) - USDA, accessed August 2, 2025,
Diagnosing Soil Compaction Using a Penetrometer (soil compaction tester) - USDA, accessed August 2, 2025,
Methodology Source Journal

Diagnosing Soil Compaction Using a Penetrometer (soil compaction tester) - USDA, accessed August 2, 2025,

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Preview of Documentation:Soil Compaction - Penetrometer Resistance - UBC Wiki, accessed August 2, 2025,
Documentation:Soil Compaction - Penetrometer Resistance - UBC Wiki, accessed August 2, 2025,
Methodology Source GreyLiterature

Documentation:Soil Compaction - Penetrometer Resistance - UBC Wiki, accessed August 2, 2025,

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Preview of Rain-ready rangelands: Staggering potential on a vast scale - Soils For Life, accessed August 2, 2025,
Rain-ready rangelands: Staggering potential on a vast scale - Soils For Life, accessed August 2, 2025,
Contextual Support Journal

National recovery plan for the MacDonnell Ranges Cycad (Macrozamia macdonnellii) - DCCEEW, accessed August 2, 2025,

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Preview of Rangeland condition: its meaning and use - a discussion paper - DCCEEW, accessed August 2, 2025
Rangeland condition: its meaning and use - a discussion paper - DCCEEW, accessed August 2, 2025
Contextual Support Journal

Rangeland condition: its meaning and use - a discussion paper - DCCEEW, accessed July 22, 2025

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Preview of Report card on sustainable natural resource use in agriculture, accessed July 6, 2025,
Report card on sustainable natural resource use in agriculture, accessed July 6, 2025,
Contextual Support

Managing soils | Department of Primary Industries and Regional Development - dpird, accessed August 28, 2025

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Preview of Resistance and resilience of the forest soil microbiome to logging-associated compaction, accessed August 2, 2025,
Resistance and resilience of the forest soil microbiome to logging-associated compaction, accessed August 2, 2025,
Contextual Support Journal

A Review of the Effects of Soil Compaction and Amelioration Treatments on Landscape Trees | Arboriculture & Urban Forestry, accessed July 22, 2025,

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Preview of Resistance and resilience of the forest soil microbiome to logging-associated compaction, accessed July 30, 2025,
Resistance and resilience of the forest soil microbiome to logging-associated compaction, accessed July 30, 2025,
Contextual Support Journal

Use Our: Soil Penetrometer - onondaga county soil & water conservation district, accessed August 2, 2025

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Preview of simple correction method of soil penetration resistance for soil water content - SciELO, accessed August 2, 2025,
simple correction method of soil penetration resistance for soil water content - SciELO, accessed August 2, 2025,
Methodology Source Journal

simple correction method of soil penetration resistance for soil water content - SciELO, accessed August 2, 2025,

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Preview of Soil | Australia state of the environment 2021, accessed August 3, 2025,
Soil | Australia state of the environment 2021, accessed August 3, 2025,
Methodology Source

The effects of clipping frequency and nitrogen fertilisation on greenhouse gas emissions and net ecosystem exchange in an Australian temperate grassland - CSIRO PUBLISHING | The Rangeland Journal

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Preview of Soil compaction - Queensland Government publications, accessed August 2, 2025,
Soil compaction - Queensland Government publications, accessed August 2, 2025,
Contextual Support Journal

Soil condition | NSW State of the Environment, accessed July 27, 2025,

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Preview of Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia, accessed August 2, 2025,
Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia, accessed August 2, 2025,
Contextual Support Journal

Soil Compaction Affects the Growth and Establishment of Street Trees in Urban Australia, accessed August 2, 2025,

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Preview of Soil compaction and the architectural plasticity of root systems - PMC, accessed August 2, 2025,
Soil compaction and the architectural plasticity of root systems - PMC, accessed August 2, 2025,
Contextual Support GreyLiterature

Soil compaction and the architectural plasticity of root systems - PMC, accessed August 2, 2025,

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Preview of Soil Compaction Explained - Soil Quality Knowledge Base, accessed August 2, 2025,
Soil Compaction Explained - Soil Quality Knowledge Base, accessed August 2, 2025,
Contextual Support

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Preview of Soil condition | NSW State of the Environment, accessed August 10, 2025,
Soil condition | NSW State of the Environment, accessed August 10, 2025,
Contextual Support Government

The relationships between land management practices and soil condition and the quality of ecosystem services delivered from agri - DAFF, accessed July 28, 2025,

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Preview of Soil Constraints in an Arid Environment—Challenges, Prospects, and Implications - MDPI, accessed July 6, 2025,
Soil Constraints in an Arid Environment—Challenges, Prospects, and Implications - MDPI, accessed July 6, 2025,
Contextual Support Journal

Soil pH | Environment, land and water - Queensland Government, accessed July 28, 2025

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Preview of Soil health - Penetrometer - Department for Environment and Water, accessed August 2, 2025,
Soil health - Penetrometer - Department for Environment and Water, accessed August 2, 2025,
Contextual Support Journal

Soil health - Department for Environment and Water, accessed July 27, 2025,

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Preview of Soil limitations to water entry - Queensland Government publications, accessed August 2, 2025,
Soil limitations to water entry - Queensland Government publications, accessed August 2, 2025,
Contextual Support Journal

Soil limitations to water entry - Queensland Government publications, accessed August 2, 2025,

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Preview of The effects of compaction and soil drying on penetrometer resistance - ResearchGate, accessed August 2, 2025,
The effects of compaction and soil drying on penetrometer resistance - ResearchGate, accessed August 2, 2025,
Contextual Support Journal

soils - of the australian alps, accessed August 11, 2025

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Context

  • Region Australia
  • Biome Arid Mountain Ranges & Uplands
  • Land Use Conservation / Protected Natural Areas
  • Assessment Pristine Reference
  • Evidence Type ReferenceCondition

Lifecycle

  • Status Active
  • Version 1
  • Effective From 19 Mar 2026

Notes

No upper detrimental threshold — higher values are always better up to natural saturation. Lower Boundary: While lower values are generally better for root growth, a value approaching zero may indicate a lack of soil cohesion, leading to instability and erosion. Upper Boundary: Values exceeding 1500 kPa represent the onset of significant ecological stress due to root growth restriction. Values above 2500 kPa indicate a severely degraded, compacted state. Optimal Range: The optimal range is as low as possible (< 500 kPa) while maintaining soil stability.