Litter Cover

AUS-TMI-AGR-LIT General Moderate confidence

Benchmark Value

60 %

Direction: Higher is desirable ↑

Form: Point

Scoring Curve

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Evidence & Context

Lower Critical Threshold: 60%. Below this level, there is a high and unacceptable risk of accelerated soil erosion and runoff.

Metric Definition:

Litter cover is the proportion of the soil surface covered by non-living, detached plant material such as crop residues (stubble, trash), leaves, and twigs.

Benchmark Definition:

This benchmark defines the critical lower threshold of litter cover below which soil erosion risk increases significantly in tropical island agricultural systems.

Justification:

This value is anchored by legally mandated minimums for tropical agriculture in Queensland designed to protect sensitive downstream marine ecosystems and supported by functional studies showing a collapse in erosion control benefits at lower cover levels.

Sources (2)

Preview of Benefits of Leaf Litter for Forest Regeneration - Tunley Environmental

Benefits of Leaf Litter for Forest Regeneration - Tunley Environmental Journal

Stubble Retention in Cropping Systems in Southern Australia ..., accessed August 13, 2025

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The effect of litter layer on controlling surface runoff and erosion in ...

The effect of litter layer on controlling surface runoff and erosion in rubber plantations on tropical mountain slopes, SW China | Request PDF - ResearchGate

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Supporting Sources (8)

Additional references from the underlying research that informed this benchmark.

Maintaining groundcover to reduce erosion and sustain production - NSW Department of Primary Industries, accessed July 22, 2025,

Direct Evidence Journal

Lang, D. (1979). Groundcover for pastures. Journal of Soil Conservation NSW.

View Source

Management of sugarcane harvest residues: consequences for soil carbon and nitrogen

Contextual Support Journal

FARMING SYSTEMS AND THEIR EFFECT ON THE RESPONSE OF SUGARCANE TO NITROGEN By B SALTER - Sugar Research Australia, accessed July 18, 2025

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Managing ground cover on erosion prone soils: Guidelines to follow, accessed July 12, 2025,

Contextual Support

Management of sugarcane harvest residues: consequences for soil carbon and nitrogen, accessed July 26, 2025

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Managing stubble | General agronomy | Crop production | Grains, pulses and cereals - Agriculture Victoria

Contextual Support Government

Managing stubble | General agronomy | Crop production | Grains, pulses and cereals - Agriculture Victoria, accessed August 13, 2025

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Nutrient Cycling in Tropical Pastures: What do we know? - ResearchGate

Contextual Support GreyLiterature

Nutrient Cycling in Tropical Pastures: What do we know? - ResearchGate

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Reef protection regulations Banana Erosion and sediment control guide Version 2 - Queensland Government, accessed July 18, 2025,

Regulatory Framework Journal

Repairing gully erosion in Western Australia - Department of Primary Industries and Regional Development, accessed July 27, 2025,

View Source

Reef protection regulations Sugarcane Sediment and erosion control guide Version 2 - Queensland Government

Regulatory Framework Journal

Reef protection regulations Sugarcane Sediment and erosion control guide Version 2 - Queensland Government

View Source

Soil management for sugarcane - NSW Department of Primary ...

Contextual Support Journal

The effect of litter layer on controlling surface runoff and erosion in ..., accessed July 26, 2025

View Source

Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Agricultural Crop Production
Assessment Not Stated
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 3 Jun 2026

Notes

Below 60% litter cover represents a state of significant ecological risk and failure to meet established best-practice standards for the region. AssessmentContext defaulted to 'Not Stated' because the source document did not state one.

Related Benchmarks

Other benchmarks in the AUS-TMI-AGR-LIT family.