Soil Moisture

AUS-AMR-AGR-SMO General Moderate confidence

Benchmark Value

No specific value — see range

Range: 12 to 15 %

Thresholds: Lower: 7, Upper: —

Optimal Range: 12 to 15

Direction: Higher is desirable ↑

Form: OptimalRange

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 7 benchmarks together — the OptimalRange form drives the primary score, while 6 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard OptimalRange Guard LowerThreshold Guard OptimalRange Guard OptimalRange Guard UpperThreshold Guard

Evidence & Context

Based on this synthesis, a reference value range of 12% to 15% volumetric soil moisture is proposed.

Metric Definition:

Volumetric soil moisture content representing an optimal soil moisture level for ecological health in best-practice dryland cropping systems.

Benchmark Definition:

This benchmark represents the optimal volumetric soil moisture range for ecological health in arid upland agricultural cropping systems, indicating a healthy and resilient soil moisture state.

Justification:

It is derived via synthesis, as no direct measurement for this specific context exists. The value sits within an optimal functional range bounded by a lower critical threshold of ~7% volumetric water content (VWC), below which significant ecosystem water stress begins, and an upper detrimental threshold defined by the onset of anoxia when air-filled porosity falls below 10%. The 12-15% value reflects a managed moisture surplus achieved under best-practice (e.g., early-terminated cover crop), which has been shown to drive significant yield and soil health benefits, while providing a buffer against drought without risking waterlogging.

Sources (2)

Critical soil moisture thresholds of plant water stress in terrestrial ecosystems Journal

Critical soil moisture thresholds of plant water stress in terrestrial ...

View Source

Preview of The impact, identification and management of dispersive soils in rainfed cropping systems - UQ eSpace - The University of Queensland, accessed July 6, 2025,

The impact, identification and management of dispersive soils in rainfed cropping systems - UQ eSpace - The University of Queensland, accessed July 6, 2025, Journal

Cover cropping impacts on soil water and carbon in dryland ...

View Source

Supporting Sources (4)

Additional references from the underlying research that informed this benchmark.

Managing soils during and after drought in cropping systems - Fact sheet - Soil CRC, accessed July 27, 2025,

Contextual Support Journal

Managing soils during and after drought in cropping systems - Fact sheet - Soil CRC, accessed July 27, 2025,

View Source

Soil and Landscape Grid of Australia - CSIRO, accessed July 30, 2025,

Contextual Support

Soil and Landscape Grid of Australia - CSIRO, accessed August 1, 2025

View Source

Soil quality indicators to assess functionality of restored soils in degraded semiarid ecosystems - Solvita, accessed July 27, 2025,

Contextual Support Journal

Soil quality indicators to assess functionality of restored soils in degraded semiarid ecosystems - Solvita, accessed July 27, 2025,

View Source

Waterlogging in Australian agricultural landscapes: a review of plant responses and crop models - ResearchGate, accessed July 7, 2025,

Contextual Support Journal

Manage wet soils – North East Victoria, Southern NSW and South West Victoria (Upper)

View Source

Context

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

Lifecycle

Status Active
Version 1
Effective From 25 Mar 2026

Notes

Lower Critical Threshold: 7 %. The optimal functional range is bounded by a lower critical threshold of ~7% volumetric water content (θcrit) and an upper detrimental threshold defined by air-filled porosity falling below 10%. The benchmark reflects a managed moisture surplus achieved under best-practice management.