Soil pH

AUS-AKW-AGR-SPH General High confidence

Benchmark Value

7.5 pH
Direction: Higher is desirable ↑
Form: Point

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 MinimumOnly Guard MaximumOnly Guard

Evidence & Context

A single value of pH(water) 7.5 is proposed as the benchmark. This value sits comfortably within the optimal range (6.5–8.0).

Metric Definition:

Soil pH (water) as a measure of soil acidity or alkalinity affecting nutrient availability and ecosystem health.

Benchmark Definition:

This benchmark represents the optimal soil pH level for sustainable and regenerative agricultural cropping in Australia's alkaline Arid Karstic Woodlands, balancing nutrient availability and ecosystem health.

Justification:

Derived from a defined optimal functional range of pH(water) 6.5–8.0, balancing inherent alkalinity with nutritional requirements. Reflects a state of high ecological function achieved through regenerative practices.

Sources (3)

Preview of Regenerative Agriculture Program restoring soil pH case study ..., accessed July 22, 2025
Regenerative Agriculture Program restoring soil pH case study ..., accessed July 22, 2025 GreyLiterature

Regenerative Agriculture Program restoring soil pH case study ...

View Source
Preview of Soil pH - SA | Fact Sheets | soilquality.org.au
Soil pH - SA | Fact Sheets | soilquality.org.au Government

Soil Acidity - NSW | Fact Sheets | soilquality.org.au

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Preview of Use of on-farm acidic sand to ameliorate calcareous-saline-alkaline heavy soils and improve plant available water - Grains Research and Development Corporation (GRDC)
Use of on-farm acidic sand to ameliorate calcareous-saline-alkaline heavy soils and improve plant available water - Grains Research and Development Corporation (GRDC) Journal

(PDF) Calcareous Soil and Their Management – A Review - ResearchGate

View Source

Supporting Sources (18)

Additional references from the underlying research that informed this benchmark.

Preview of Calcareous Soils Initiative - GRDC, accessed July 22, 2025,
Calcareous Soils Initiative - GRDC, accessed July 22, 2025,
Contextual Support Government

Some Characteristics of Calcareous soils. A review A.S. Taalab1, G.W. Ageeb2, Hanan S. Siam1 and Safaa A. Mahmoud1 - CURRENT RESEARCH WEB

View Source
Preview of Discover the Top 6 Benefits of Regenerative Farming in Australia, accessed August 5, 2025,
Discover the Top 6 Benefits of Regenerative Farming in Australia, accessed August 5, 2025,
Contextual Support GreyLiterature

Regenerative agriculture in Australia: the changing face of farming - Frontiers, accessed July 23, 2025

View Source
Preview of Distribution, characteristics and management of calcareous soils, accessed July 22, 2025
Distribution, characteristics and management of calcareous soils, accessed July 22, 2025
Contextual Support GreyLiterature

Distribution, characteristics and management of calcareous soils

View Source
Preview of Eyre Peninsula Farming Systems Summary 2023 - Department of Primary Industries and Regions, accessed July 22, 2025,
Eyre Peninsula Farming Systems Summary 2023 - Department of Primary Industries and Regions, accessed July 22, 2025,
Contextual Support Government

Victorian Grain Cropping Soils - Calcarosols | VRO | Agriculture Victoria

View Source
Preview of Managing Soil pH for Crop Production in Calcareous-Alkaline Soil - Issuu, accessed July 22, 2025
Managing Soil pH for Crop Production in Calcareous-Alkaline Soil - Issuu, accessed July 22, 2025
Contextual Support GreyLiterature

Managing Soil pH for Crop Production in Calcareous-Alkaline Soil - Issuu

View Source
Preview of Nullarbor Plain - Wikipedia, accessed July 25, 2025,
Nullarbor Plain - Wikipedia, accessed July 25, 2025,
Contextual Support GreyLiterature

Nullarbor Plain - Wikipedia, accessed July 24, 2025

View Source
Preview of Overcoming constraints on highly calcareous soils | GroundCover - GRDC Ground Cover, accessed July 22, 2025
Overcoming constraints on highly calcareous soils | GroundCover - GRDC Ground Cover, accessed July 22, 2025
Contextual Support GreyLiterature

Overcoming constraints on highly calcareous soils | GroundCover - GRDC Ground Cover

View Source
Preview of Regenerative Agriculture - Landscape SA, accessed July 6, 2025,
Regenerative Agriculture - Landscape SA, accessed July 6, 2025,
Contextual Support Government

Regenerative Agriculture Program - Landscape SA

View Source
Preview of Regenerative Agriculture Australia: Benefits and Practices - SONIC Natural Farming, accessed July 22, 2025,
Regenerative Agriculture Australia: Benefits and Practices - SONIC Natural Farming, accessed July 22, 2025,
Contextual Support GreyLiterature

More profitable crops on highly calcareous soils by improving early vigour and overcoming soil constraints | AIR EP

View Source
Preview of Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed August 5, 2025,
Contextual Support Journal

Regenerative Agriculture—A Literature Review on the Practices and Mechanisms Used to Improve Soil Health - MDPI, accessed July 20, 2025,

View Source
Preview of Soil constraints project - an update on the economic response of long term soil amelioration strategies - GRDC, accessed July 22, 2025
Soil constraints project - an update on the economic response of long term soil amelioration strategies - GRDC, accessed July 22, 2025
Contextual Support Government

Soil constraints project - an update on the economic response of long term soil amelioration strategies - GRDC

View Source
Preview of Soil Inorganic Carbon, the Other and Equally Important Soil Carbon Pool: Distribution, Controlling Factors, and the Impact of C, accessed July 26, 2025
Soil Inorganic Carbon, the Other and Equally Important Soil Carbon Pool: Distribution, Controlling Factors, and the Impact of C, accessed July 26, 2025
Contextual Support GreyLiterature

Chapter 5, accessed July 22, 2025

View Source
Preview of Soil organic matter in cropping systems - NSW Department of Primary Industries, accessed July 22, 2025,
Soil organic matter in cropping systems - NSW Department of Primary Industries, accessed July 22, 2025,
Contextual Support Journal

SOIL pH—SOUTH AUSTRALIA

View Source
Preview of Soil pH - SA | Fact Sheets | soilquality.org.au, accessed July 22, 2025
Soil pH - SA | Fact Sheets | soilquality.org.au, accessed July 22, 2025
Contextual Support Journal

Soil pH - SA | Fact Sheets | soilquality.org.au, accessed July 22, 2025

View Source
Preview of Soil pH | Environment, land and water - Queensland Government, accessed July 22, 2025
Soil pH | Environment, land and water - Queensland Government, accessed July 22, 2025
Contextual Support GreyLiterature

Soil pH | Environment, land and water - Queensland Government

View Source
Preview of Soil pH | Environment, land and water - Queensland Government, accessed July 30, 2025,
Soil pH | Environment, land and water - Queensland Government, accessed July 30, 2025,
Contextual Support Government

Australian dryland soils are acidic and nutrient‐depleted, and have unique microbial communities compared with other drylands - Arid Ecology Lab

View Source
Preview of Taking the heat out of soil health | Landscape Boards SA, accessed July 22, 2025
Taking the heat out of soil health | Landscape Boards SA, accessed July 22, 2025
Contextual Support Government

Taking the heat out of soil health | Landscape Boards SA

View Source
Preview of What are some possible explanations for the lack of vegetation on the Nullarbor Plain of Western Australia? - Quora, accessed July 27, 2025
What are some possible explanations for the lack of vegetation on the Nullarbor Plain of Western Australia? - Quora, accessed July 27, 2025
Contextual Support GreyLiterature

What are some possible explanations for the lack of vegetation on the Nullarbor Plain of Western Australia? - Quora

View Source

Context

  • Region Australia
  • Biome Arid Karstic Woodlands & Shrublands
  • Land Use Agricultural Crop Production
  • Assessment Agricultural Biodiversity Target
  • Vegetation Woodland
  • Evidence Type HealthyOperationalRange

Lifecycle

  • Status Active
  • Version 1
  • Effective From 10 Jun 2026

Notes

Lower Critical Threshold: 6.5 pH. Upper Detrimental Threshold: 8.5 pH. The benchmark avoids nutrient lock-up at very high pH and respects the soil's natural alkaline character.