Soil Structure & Compaction

AUS-TSR-CON-SSC General Moderate confidence

Benchmark Value

3500 kPa

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 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

The prevalence of biopores in healthy rainforest soils suggests the true critical limit for severe impedance may be closer to 3500 kPa.

Metric Definition:

Penetrometer resistance threshold indicating severe impedance to root growth in rainforest soils.

Benchmark Definition:

Severe impedance threshold for root growth in structurally complex rainforest soils.

Justification:

Based on studies of no-till systems analogous to rainforest soils with abundant biopores.

Sources (1)

Preview of Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 30, 2025,

Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 30, 2025, Government

Australian Soils and Landscapes | Monitoring & Data | TERN - esoil.io, accessed July 17, 2025,

View Source

Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

(PDF) How the Soil Resistance to Penetration Affects the Development of Agricultural Crops? - ResearchGate

Contextual Support Journal

(PDF) How the Soil Resistance to Penetration Affects the Development of Agricultural Crops? - ResearchGate

View Source

Criteria and Indicators for Sustainable Forest Management in Victoria, accessed July 19, 2025

Direct Evidence Journal

Soil health: the foundation of sustainable agriculture - 2001 ...

View Source

Early Response of Soil Properties and Function to Riparian ...

Direct Evidence Journal

Early Response of Soil Properties and Function to Riparian ...

View Source

Safflower root and shoot growth affected by soil compaction - SciELO, accessed August 4, 2025,

Direct Evidence

Safflower root and shoot growth affected by soil ... - SciELO Brasil

View Source

Context

Region Australia
Biome Tropical & Subtropical Rainforests
Land Use Conservation / Protected Natural Areas
Assessment Pristine Reference
Vegetation Forest
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

Represents a more realistic limit for severe root growth impedance in rainforest soils.

Related Benchmarks

Other benchmarks in the AUS-TSR-CON-SSC family.