Soil Structure & Compaction
Benchmark Value
Scoring Curve
This curve shows how a field measurement for this indicator would score across all available benchmark forms in this context.
Evidence & Context
The benchmark is a synthesis of physiologically-based ecological thresholds for root impedance and proxy data from high-integrity reference sites. The 1,500 kPa value represents the upper limit of soil strength observed in healthy, minimally disturbed Vertosol soils and coincides with the widely documented threshold at which root growth of native and agricultural plants begins to be significantly restricted.
Cone Penetrometer Resistance (kPa), measured when the soil profile is uniformly wet (at or near Field Capacity).
This benchmark defines the upper limit of soil strength in Australia's arid inland floodplains where soil compaction begins to significantly restrict root growth and ecosystem function.
Grounded in well-established ecological thresholds for root limitation (~1,500 kPa), consistent across studies and validated for Australian native trees, supported by proxy data from relevant Vertosol soils.
Sources (2)
Australian Journal of Soil Research - CSIRO Publishing, accessed July 28, 2025
View SourceCompaction properties of vertisols and their potential effect on sunflower - UQ eSpace
View SourceSupporting Sources (1)
Additional references from the underlying research that informed this benchmark.
Soil condition | NSW State of the Environment
View Source