Soil Structure & Compaction

AUS-TSR-CON-SSC General Moderate confidence

Benchmark Value

500 kPa

Thresholds: Lower: —, Upper: 2000

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

A vast body of agronomic research has converged on a critical limit of 2000 kPa as a general threshold above which the root growth of many crop species is significantly impeded.

Metric Definition:

Penetrometer resistance threshold above which root growth is significantly impeded.

Benchmark Definition:

Critical penetrometer resistance limit for root growth inhibition.

Justification:

Widely cited agronomic research threshold for root growth limitation.

Sources (1)

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

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

View Source

Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

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

Direct Evidence Government

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

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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
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

This threshold is conservative for rainforest soils with biopores. ConsistencyResolver applied 2026-03-23 00:15 UTC: BenchmarkValue 2000 → (check: MinAboveOptimalHigh, rationale: Clearing BenchmarkValue to avoid duplication/conflict since the threshold is now stored in UpperThreshold.) ConsistencyResolver applied 2026-03-23 00:15 UTC: UpperThreshold → 2000 (check: MinAboveOptimalHigh, rationale: The Notes indicate that values above 2000 kPa cause degradation, so this threshold is an upper limit. Moving the threshold to UpperThreshold will auto-correct the form from MinimumOnly to MaximumOnly, resolving the MinAboveOptimalHigh contradiction.) ConsistencyResolver applied 2026-03-23 00:15 UTC: BenchmarkValue 2000 → 500 (check: MinAboveMax, rationale: Swapping values to correct form assignment: the MinimumOnly benchmark (ID=1413) should have the lower threshold (500 kPa) representing the healthy lower floor, consistent with the MaximumOnly benchmark's original value.)

Related Benchmarks

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