Litter Cover

AUS-TMI-AGR-LIT General Moderate confidence

Benchmark Value

60 %

Direction: Higher is desirable ↑

Form: MinimumOnly

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 14 benchmarks together — the OptimalRange form drives the primary score, while 13 guard(s) constrain the result.

Contributing Benchmarks

OptimalRange Primary MinimumOnly Guard Point Guard LowerThreshold Guard MinimumOnly Guard OptimalRange Guard Point Guard MinimumOnly Guard MinimumOnly Guard OptimalRange Guard Point Guard MinimumOnly Guard OptimalRange Guard Point Guard

Evidence & Context

The Queensland Government's legally mandated 60% minimum for tropical horticulture provides a robust and defensible floor.

Metric Definition:

Litter Cover (%) - 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 represents the minimum legally mandated litter cover percentage to prevent unacceptable soil erosion in tropical island agricultural systems in Australia.

Justification:

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

Sources (2)

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

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

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

View Source

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

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

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

View Source

Supporting Sources (6)

Additional references from the underlying research that informed this benchmark.

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

View Source

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,

View Source

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

Contextual Support GreyLiterature

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

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

Groundcover essential for healthy soils - Local Land Services - NSW Government, accessed July 27, 2025,

View Source

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

Direct Evidence

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

View Source

Context

Region Australia
Biome Tropical & Subtropical Maritime Islands
Land Use Agricultural Crop Production
Assessment Pristine Reference
Evidence Type DegradationThreshold

Lifecycle

Status Active
Version 1
Effective From 17 Mar 2026

Notes

Below this level, there is a high and unacceptable risk of accelerated soil erosion and runoff, particularly given the high-energy rainfall events characteristic of the biome.