Soil Moisture — Benchmark Detail

Benchmark Value

No specific value — see range

Range: 25 to 40 %

Thresholds: Lower: 19, Upper: —

Optimal Range: 25 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 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

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:

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).

Benchmark Definition:

This benchmark represents the optimal soil moisture range in the top 0-30 cm of soil within agricultural crop production systems in Australia's Tropical & Subtropical Rainforests. It defines the Readily Available Water range that supports plant health and soil biological activity while avoiding water stress and waterlogging.

Justification:

Confidence is High as 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.

Supporting Sources (2)

Additional references from the underlying research that informed this benchmark.

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

Contextual Support Journal

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

View Source

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 Pristine Reference
Evidence Type ReferenceCondition

Lifecycle

Status Active
Version 1
Effective From 24 Mar 2026

Notes

A single numerical value is scientifically indefensible for this context due to significant variation in soil types (Ferrosols, Kandosols, Alluvials). This benchmark defines the 'best available condition' as a functional state achieved through regenerative practices (e.g., no-till, cover crops) that maximize Plant Available Water Capacity (PAWC) and maintain moisture in the optimal zone for ecological function and plant health. Lower Boundary: The critical lower threshold is the Permanent Wilting Point (PWP), typically at a soil water potential of -1500 kPa, below which irreversible plant damage and cessation of key ecological functions occur. Plant stress and reduced productivity begin as moisture drops below the Readily Available Water (RAW) zone. Upper Boundary: A detrimental upper threshold exists and is defined by prolonged waterlogging (sustained anaerobic conditions at or above Field Capacity), not temporary saturation. This leads to nutrient loss via denitrification, root death, and increased disease susceptibility. The resilience to waterlogging is higher in well-structured soils under best-practice management. Optimal Range: The optimal range is the RAW zone (the upper 50-100% of PAWC). This range maximizes nutrient and water availability for plants and supports robust soil biological activity, while avoiding the stresses associated with both water deficit and waterlogging. [Migration] Original wider evidence range: 19 – 40 (retained OptimalRange: 25 – 40)