Soil Structure & Compaction

AUS-TDG-AGR-SSC General Moderate confidence

Benchmark Value

1000 kPa

Thresholds: Lower: —, Upper: 2000

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 17 benchmarks together — the OptimalRange form drives the primary score, while 16 guard(s) constrain the result.

Contributing Benchmarks

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

Evidence & Context

The proposed reference value for soil penetrometer resistance, representing the "best available condition" under sustainable or regenerative agricultural crop production in this biome, is a target of < 1000 kPa, with an aspirational goal of achieving < 500 kPa in the topsoil (e.g., 0-15 cm or 0-30 cm depth).

Metric Definition:

Soil penetrometer resistance (PR) as a measure of soil mechanical impedance to root growth.

Benchmark Definition:

This benchmark represents the maximum soil penetrometer resistance under sustainable or regenerative agricultural crop production in the Temperate Dry Woodlands & Native Grasslands biome of Australia, indicating minimal mechanical impedance to root growth.

Justification:

This range (< 1000 kPa, ideally < 500 kPa) represents conditions with minimal to no mechanical impedance to plant root growth and proliferation. It aligns with observed low PR values in minimally disturbed native temperate woodland ecosystems and is achievable through best-practice regenerative management.

Sources (1)

Preview of (PDF) Determining reference conditions for management and ...

(PDF) Determining reference conditions for management and ... GreyLiterature

(PDF) Determining reference conditions for management and ..., accessed May 10, 2025,

View Source

Supporting Sources (9)

Additional references from the underlying research that informed this benchmark.

(PDF) Determining reference conditions for management and ..., accessed August 5, 2025,

Contextual Support

(PDF) Impacts of tree invasion on floristic composition of subtropical grasslands on the Bunya Mountains, Australia - ResearchGate, accessed May 19, 2025

View Source

(PDF) Improving soil physical fertility and crop yield on a clay soil in ...

Direct Evidence GreyLiterature

Dynamics of soil penetration resistance, moisture depletion pattern and crop productivity determined by mechanized cultivation and lifesaving irrigation in zero till blackgram - PMC - PubMed Central

View Source

Preview of Agronomic, Soil Quality and Environmental Consequences of Using Compost in Vegetable Production | Request PDF - ResearchGate, accessed May 10, 2025,

Agronomic, Soil Quality and Environmental Consequences of Using Compost in Vegetable Production | Request PDF - ResearchGate, accessed May 10, 2025,

Contextual Support Journal

Long Term Effect of Conservation Agriculture in Maize Rotations on Soil Total Organic Carbon, Physical and Biological Properties | Request PDF - ResearchGate, accessed May 10, 2025,

View Source

From soil health to agricultural productivity - University of Southern Queensland Repository, accessed May 10, 2025,

Contextual Support Journal

Role of earthworms in regenerating soil structure after compaction in reduced tillage systems | Request PDF - ResearchGate, accessed May 10, 2025,

View Source

Preview of Influence of tree species and forest land use on soil hydraulic conductivity and implications for surface runoff generation | Request PDF - ResearchGate, accessed May 10, 2025,

Influence of tree species and forest land use on soil hydraulic conductivity and implications for surface runoff generation | Request PDF - ResearchGate, accessed May 10, 2025,

Contextual Support GreyLiterature

Influence of tree species and forest land use on soil hydraulic conductivity and implications for surface runoff generation | Request PDF - ResearchGate, accessed May 10, 2025,

View Source

Living soils in agriculture | TERN Australia, accessed July 25, 2025,

Contextual Support Government

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

View Source

Soil compaction - Queensland Government publications, accessed August 2, 2025,

Contextual Support Journal

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

View Source

Soil compaction | Environment, land and water | Queensland Government, accessed August 4, 2025,

Contextual Support Government

Soil Management for Sustainable Agriculture - MDPI, accessed May 10, 2025,

View Source

Soil Structural Quality and Relationships With Root Properties in Single and Integrated Farming Systems - Frontiers

Contextual Support Journal

Soil Structural Quality and Relationships With Root Properties in Single and Integrated Farming Systems - Frontiers, accessed May 10, 2025,

View Source

Context

Region Australia
Biome Temperate Dry Woodlands & Native Grasslands
Land Use Agricultural Crop Production
Assessment Pristine Reference
Evidence Type TargetCondition

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

Measurements should be made under standardized soil moisture conditions, ideally at or near field capacity, to ensure comparability. The aspirational target of < 500 kPa is for topsoil layers (0-15 cm or 0-30 cm depth). ConsistencyResolver applied 2026-03-23 00:19 UTC: UpperThreshold 1000 → 2000 (check: MinAboveMax, rationale: The MaximumOnly benchmark currently has an upper threshold of 1000 kPa, but the MinimumOnly threshold is higher and represents an upper limit. Swapping values aligns thresholds with ecological meaning and resolves the contradiction.)

Related Benchmarks

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