Soil Moisture

AUS-TSR-AGR-SMO General High confidence

Benchmark Value

No specific value — see range
Range: 19 to 40 % VWC
Optimal Range: 19 to 40
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 4 benchmarks together — the OptimalRange form drives the primary score, while 3 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary Point Guard OptimalRange Guard MinimumOnly Guard

Evidence & Context

Reference Value: Maintenance of topsoil (0-30 cm) moisture within the Readily Available Water (RAW) range, defined as the upper 50-100% of the soil's Plant Available Water Capacity (PAWC). This corresponds to a dynamic state between the crop-specific refill point and the soil-specific Field Capacity.

Metric Definition:

Volumetric Water Content (VWC) is the volume of water per unit volume of bulk soil, expressed as a percentage, representing the soil moisture content.

Benchmark Definition:

This benchmark defines the optimal soil moisture range in tropical and subtropical rainforest agricultural crop production as the Readily Available Water (RAW) range, representing the upper 50-100% of Plant Available Water Capacity (PAWC). Maintaining soil moisture within this range supports healthy plant growth and soil function.

Justification:

This principle-based benchmark is derived from fundamental soil physics and plant physiology concepts (Field Capacity, Permanent Wilting Point, Plant Available Water) that are well-established in Australian agricultural science.

Sources (1)

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

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

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Supporting Sources (1)

Additional references from the underlying research that informed this benchmark.

Preview of SOIL-SPECIFIC NUTRIENT MANAGEMENT GUIDELINES - Sugar ..., accessed July 16, 2025,
SOIL-SPECIFIC NUTRIENT MANAGEMENT GUIDELINES - Sugar ..., accessed July 16, 2025,
Direct Evidence

SOIL-SPECIFIC NUTRIENT MANAGEMENT GUIDELINES - Sugar ...

View Source

Context

  • Region Australia
  • Biome Tropical & Subtropical Rainforests
  • Land Use Agricultural Crop Production
  • Assessment Not Stated
  • Evidence Type HealthyOperationalRange

Lifecycle

  • Status Active
  • Version 1
  • Effective From 9 Jun 2026

Notes

The benchmark defines the 'best available condition' as a functional state achieved through regenerative practices that maximize PAWC and maintain moisture in the optimal zone for ecological function and plant health. The lower boundary is the Permanent Wilting Point (PWP), below which irreversible plant damage occurs. The upper boundary is defined by prolonged waterlogging at or above Field Capacity, leading to nutrient loss and root damage. The optimal range maximizes nutrient and water availability while avoiding stress from deficit or excess water. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.