Soil Structure & Compaction

AUS-AIF-AGR-SSC General Moderate confidence

Benchmark Value

1500 kPa

Thresholds: Lower: —, Upper: 1500

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

Based on the consensus in the scientific literature, the threshold at which soil compaction begins to significantly compromise the ecological function of arid cropping systems is 1500 kPa.

Metric Definition:

Penetrometer resistance threshold above which root growth is restricted and ecological function is impaired.

Benchmark Definition:

This benchmark defines the critical penetrometer resistance threshold indicating the onset of root growth restriction in arid inland floodplains under agricultural crop production.

Justification:

This threshold marks the boundary between a 'moderately healthy' state and a 'degraded' one, representing a critical tipping point for ecosystem health.

Sources (1)

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

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

Context

Region Australia
Biome Arid Inland Floodplains & Ephemeral River Systems
Land Use Agricultural Crop Production
Assessment Pristine Reference
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

Soil strength >1500 kPa begins to restrict root growth, and >2500 kPa severely restricts it. ConsistencyResolver applied 2026-03-23 00:14 UTC: LowerThreshold 1500 → (check: MinAbovePointValue, rationale: Removing LowerThreshold because the threshold is an upper degradation limit, not a lower floor.) ConsistencyResolver applied 2026-03-23 00:20 UTC: UpperThreshold → 1500 (check: MinAbovePointValue, rationale: Moving the threshold to UpperThreshold to reflect that soil strength above 1500 kPa causes degradation, consistent with Notes. This will auto-correct the form to MaximumOnly.) [Auto-corrected BenchmarkForm: MinimumOnly → MaximumOnly] ConsistencyResolver applied 2026-03-23 00:20 UTC: UpperThreshold → 1500 (check: MinAbovePointValue, rationale: Moving the threshold to UpperThreshold to reflect that soil strength above 1500 kPa causes degradation, consistent with Notes. This will auto-correct the form to MaximumOnly.)

Related Benchmarks

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