Soil Structure & Compaction

AUS-AMR-AGR-SSC General Moderate confidence

Benchmark Value

2500 kPa

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 value of <1000 kPa is selected as the reference benchmark.

Metric Definition:

Penetrometer resistance, a measure of the force required to push a standard-sized cone through the soil profile, expressed in kilopascals (kPa), indicating soil strength and mechanical impedance to root growth.

Benchmark Definition:

This benchmark represents soil strength at field capacity where root growth is unimpeded under regenerative agriculture in the Arid Mountain Ranges & Uplands biome.

Justification:

This value is scientifically defensible, originating from extension material designed for practical land management in South Australia, a region containing analogous arid and semi-arid cropping systems.

Sources (1)

Managing subsoil constraints for improved productivity on Eyre Peninsula Journal

Managing subsoil constraints for improved productivity on Eyre Peninsula

View Source

Context

Region Australia
Biome Arid Mountain Ranges & Uplands
Land Use Agricultural Crop Production
Assessment Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 21 Mar 2026

Notes

The benchmark of <1000 kPa represents a soil strength at field capacity where root growth is unimpeded, reflecting the best available condition under regenerative agriculture. Confidence in the functional thresholds is High due to strong consensus in Australian soil science literature. However, confidence is rated as Moderate because the benchmark is synthesized from principles and data from analogous dryland systems rather than from direct, published measurements within the specific, niche context of cropping in Australia's Arid Mountain Ranges & Uplands biome. ConsistencyResolver applied 2026-03-23 00:20 UTC: BenchmarkValue 1000 → 2500 (check: MinAboveMax, rationale: Swapping the value to 2500 kPa aligns with the Notes indicating this is the upper ceiling threshold for soil compaction. This corrects the misclassification and resolves the contradiction.)

Related Benchmarks

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