Soil Structure & Compaction

AUS-AMR-AGR-SSC General Moderate confidence

Benchmark Value

1500 kPa
Thresholds: Lower: —, Upper: 1500
Direction: Lower is desirable ↓
Form: UpperThreshold

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 14 benchmarks together — the OptimalRange form drives the primary score, while 13 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary LowerThreshold Guard MaximumOnly Guard UpperThreshold Guard MaximumOnly Guard MaximumOnly Guard Point Guard MaximumOnly Guard MinimumOnly Guard MinimumOnly Guard MaximumOnly Guard MinimumOnly Guard MaximumOnly Guard MinimumOnly Guard

Evidence & Context

Root growth begins to be restricted above 1500 kPa

Metric Definition:

penetrometer resistance—a measure of the force required to push a standard-sized cone through the soil profile, expressed in units of pressure, typically kilopascals (kPa)

Benchmark Definition:

This benchmark marks the soil strength threshold above 1500 kPa where root growth starts to be restricted, indicating declining soil conditions in arid mountain ranges and uplands under agricultural crop production.

Justification:

There is a strong and consistent consensus across Australian agricultural research and extension literature regarding the penetrometer resistance thresholds at which this occurs.

Sources (1)

Preview of Subsurface compaction; Soil Compaction and Root Growth: A Review; Nutrition on calcareous soils and deep P placement
Subsurface compaction; Soil Compaction and Root Growth: A Review; Nutrition on calcareous soils and deep P placement Government

Subsurface Compaction - NSW | Fact Sheets | soilquality.org.au, accessed July 27, 2025

View Source

Supporting Sources (35)

Additional references from the underlying research that informed this benchmark.

Preview of A Health Check for our Agricultural Soils - Enviro Data SA, accessed July 16, 2025,
A Health Check for our Agricultural Soils - Enviro Data SA, accessed July 16, 2025,
Direct Evidence Methodology Source Journal

A Health Check for our Agricultural Soils - Enviro Data SA

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Preview of accessed July 28
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Contextual Support GreyLiterature

Geography of Australia - Wikipedia, accessed July 27, 2025

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Preview of Assessment of the influence of soil structure on soil strength/soil wetness relationships on Red Ferrosols in north-west Tasmania - CSIRO PUBLISHING | Soil Research, accessed July 27, 2025
Assessment of the influence of soil structure on soil strength/soil wetness relationships on Red Ferrosols in north-west Tasmania - CSIRO PUBLISHING | Soil Research, accessed July 27, 2025
Contextual Support Methodology Source Journal

Assessment of the influence of soil structure on soil strength/soil wetness relationships on Red Ferrosols in north-west Tasmania - CSIRO PUBLISHING | Soil Research, accessed July 27, 2025

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Preview of Australia - Soils, Climate, Erosion | Britannica
Australia - Soils, Climate, Erosion | Britannica
Contextual Support GreyLiterature

SOIL TESTING

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Ch 11. Diversifying Cropping Systems - SARE, accessed August 28, 2025,
Contextual Support Methodology Source GreyLiterature

Ch 11. Diversifying Cropping Systems - SARE

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Preview of Deserts of Australia - Wikipedia, accessed July 6, 2025,
Deserts of Australia - Wikipedia, accessed July 6, 2025,
Contextual Support GreyLiterature

Deserts of Australia - Wikipedia, accessed July 27, 2025

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Preview of Discover the Top 6 Benefits of Regenerative Farming in Australia, accessed July 16, 2025
Discover the Top 6 Benefits of Regenerative Farming in Australia, accessed July 16, 2025
Contextual Support Methodology Source Journal

Soil Health: Supporting Rural Industries in the Wet Tropics, accessed August 28, 2025

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Preview of Flinders Lofty Block - Grasslands
Flinders Lofty Block - Grasslands
Contextual Support GreyLiterature

Flinders Lofty Block - Grasslands, accessed July 27, 2025

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Preview of Flinders Lofty Block - Wikipedia, accessed July 27, 2025
Flinders Lofty Block - Wikipedia, accessed July 27, 2025
Contextual Support GreyLiterature

Flinders Lofty Block - Wikipedia, accessed July 27, 2025

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Preview of Flinders Lofty Block bioregion - DCCEEW, accessed July 29, 2025,
Flinders Lofty Block bioregion - DCCEEW, accessed July 29, 2025,
Methodology Source Journal

Vicars in the desert: Substrate specialisation and paleo-erosion underpin cryptic speciation in an Australian arid-zone lizard lineage (Diplodactylidae: Diplodactylus) - Vertebrate Zoology, accessed July 28, 2025

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Preview of How do I manage the impact of compaction? - Soil Health Knowledgebase, accessed July 24, 2025
How do I manage the impact of compaction? - Soil Health Knowledgebase, accessed July 24, 2025
Contextual Support Journal

Grazing management to reduce soil damage - Agriculture Victoria

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Preview of Integration roadmap for Top End grain | GroundCover - GRDC Ground Cover, accessed July 27, 2025
Integration roadmap for Top End grain | GroundCover - GRDC Ground Cover, accessed July 27, 2025
Contextual Support GreyLiterature

Integration roadmap for Top End grain | GroundCover - GRDC Ground Cover, accessed July 27, 2025

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Preview of Interim Biogeographic Regionalisation for Australia - Wikipedia, accessed July 13, 2025,
Interim Biogeographic Regionalisation for Australia - Wikipedia, accessed July 13, 2025,
Contextual Support GreyLiterature

Category:IBRA regions - Wikipedia

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Preview of Landform Regions of Australia - ArcGIS StoryMaps, accessed July 27, 2025
Landform Regions of Australia - ArcGIS StoryMaps, accessed July 27, 2025
Contextual Support GreyLiterature

MacDonnell Ranges - A biography of the Australian continent, accessed July 27, 2025

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Preview of Living soils in agriculture | TERN Australia, accessed July 25, 2025,
Living soils in agriculture | TERN Australia, accessed July 25, 2025,
Contextual Support Methodology Source Government

Living soils in agriculture | TERN Australia, accessed July 16, 2025,

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Preview of MacDonnell Ranges bioregion - DCCEEW
MacDonnell Ranges bioregion - DCCEEW
Contextual Support Journal

Soil Constraints in an Arid Environment—Challenges, Prospects ...

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Preview of MacDonnell Ranges bioregion - DCCEEW, accessed July 27, 2025
MacDonnell Ranges bioregion - DCCEEW, accessed July 27, 2025
Contextual Support Journal

MacDonnell Ranges bioregion - DCCEEW, accessed July 27, 2025

View Source
Preview of Managing subsoil constraints for improved productivity on Eyre Peninsula
Managing subsoil constraints for improved productivity on Eyre Peninsula
Direct Evidence Journal

Managing subsoil constraints for improved productivity on Eyre Peninsula

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Preview of New insights into high soil strength and crop plants; implications for grain crop production in the Australian environment - ResearchGate, accessed August 4, 2025,
New insights into high soil strength and crop plants; implications for grain crop production in the Australian environment - ResearchGate, accessed August 4, 2025,
Contextual Support Direct Evidence GreyLiterature

Using acidic sand to detoxify subsoil boron - Grower Group Alliance, accessed July 22, 2025

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Preview of Nullarbor bioregion - DCCEEW, accessed July 26, 2025,
Nullarbor bioregion - DCCEEW, accessed July 26, 2025,
Contextual Support

Flinders Lofty Block bioregion - DCCEEW, accessed July 27, 2025

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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 Methodology Source Journal

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

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Preview of Restoration of degraded grazing country in the semi-arid areas of NSW, accessed July 24, 2025
Restoration of degraded grazing country in the semi-arid areas of NSW, accessed July 24, 2025
Contextual Support Direct Evidence GreyLiterature

GROWTH-LIMITING SOIL BULK DENSITIES AS INFLUENCED BY SOIL TEXTURE DEVELOPED BY RICHARD L. DADDOW AND GORDON E. WARRINGTON WSDG R, accessed July 27, 2025

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Preview of Seedbed Soil Structure Decline | Fact Sheets | soilquality.org.au, accessed August 28, 2025
Seedbed Soil Structure Decline | Fact Sheets | soilquality.org.au, accessed August 28, 2025
Contextual Support Direct Evidence Government

Seedbed Soil Structure Decline | Fact Sheets | soilquality.org.au

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Preview of Soil compaction | UMN Extension, accessed July 27, 2025
Soil compaction | UMN Extension, accessed July 27, 2025
Methodology Source Government

Soil compaction | UMN Extension, accessed July 27, 2025

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Preview of Soil compaction | UMN Extension, accessed July 30, 2025,
Soil compaction | UMN Extension, accessed July 30, 2025,
Contextual Support Direct Evidence Government

Soil compaction | UMN Extension, accessed July 22, 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,
Direct Evidence Journal

Soil Compaction: An inevitable part of modern agriculture or a symptom of poor soil health?, accessed July 27, 2025

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Preview of Soil Compaction in Agricultural Production | Pioneer® Seeds, accessed August 4, 2025,
Soil Compaction in Agricultural Production | Pioneer® Seeds, accessed August 4, 2025,
Contextual Support Direct Evidence GreyLiterature

Soil Health Assessment Part IV: Soil Penetration Resistance and Plant Roots – Soil and Water Conservation Laboratory Manual - New Prairie Press Open Book Publishing, accessed July 22, 2025

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Preview of Soil compaction in cropping systems A review of the nature, causes and possible solutions - Beyond Agronomy, accessed July 27, 2025
Soil compaction in cropping systems A review of the nature, causes and possible solutions - Beyond Agronomy, accessed July 27, 2025
Contextual Support Direct Evidence GreyLiterature

Soil compaction in cropping systems A review of the nature, causes and possible solutions - Beyond Agronomy, accessed July 27, 2025

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Preview of Soil Compaction: An inevitable part of modern agriculture or a symptom of poor soil health?, accessed August 4, 2025,
Soil Compaction: An inevitable part of modern agriculture or a symptom of poor soil health?, accessed August 4, 2025,
Contextual Support Methodology Source GreyLiterature

Advantages And Disadvantages Of No Till Farming, Planting, accessed July 27, 2025

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Preview of Soil Penetration Resistance and Tree Root Development - UWE Bristol Research Repository, accessed July 27, 2025,
Soil Penetration Resistance and Tree Root Development - UWE Bristol Research Repository, accessed July 27, 2025,
Contextual Support GreyLiterature

Soil Penetration Resistance and Tree Root Development - UWE Bristol Research Repository

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Preview of Soil Penetration Resistance as a Soil Health Indicator - SDSU Extension - South Dakota State University, accessed August 4, 2025,
Soil Penetration Resistance as a Soil Health Indicator - SDSU Extension - South Dakota State University, accessed August 4, 2025,
Methodology Source Government

Soil compaction and strength; measurement methods and influences on perennial grass growth.

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Preview of Soil Tests Bulk Density, accessed July 27, 2025
Soil Tests Bulk Density, accessed July 27, 2025
Contextual Support Methodology Source GreyLiterature

Soil Tests Bulk Density, accessed July 27, 2025

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Preview of Strategic tillage of a long-term, no-till soil has little impact on soil characteristics or crop growth over five years
Strategic tillage of a long-term, no-till soil has little impact on soil characteristics or crop growth over five years
Contextual Support Direct Evidence Journal

What is Regenerative Agriculture? - Soils For Life, accessed August 13, 2025

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Preview of The Broken Hill Complex Bioregion - Environment and Heritage, accessed July 27, 2025
The Broken Hill Complex Bioregion - Environment and Heritage, accessed July 27, 2025
Contextual Support

The Broken Hill Complex Bioregion - Environment and Heritage, accessed July 27, 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 Methodology Source GreyLiterature

soils - of the australian alps

View Source

Context

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

Lifecycle

  • Status Superseded
  • Version 1
  • Effective From 26 May 2026
  • Effective To 26 May 2026

Notes

When soil strength exceeds 1500 kPa, roots must expend more energy to penetrate the soil, resulting in slower growth and often thicker, stubbier roots. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-AMR-AGR-SSC family.

2500 kPa Moderate
Agricultural Crop Production · Not Stated
UpperThreshold Active v2
1000 kPa Moderate
Agricultural Crop Production · Not Stated
MaximumOnly Active v1