SoilRegen: Case studies

Case study:

Marble Hill carbon project

Marble Hill: Project summary (as of December 2024)

  • Soils treated with Agri-ash, drinking water lime residuals and paper crumble
  • 100% improvement in productivity achieved between 2021 and 2024
  • No fertilisers used in 3 years since initial treatment
  • 1711 soil carbon credits (ACCUs) issued in only 18 months - Over 24 ACCUs per hectare to date with more expected to come!
  • Out of 800+ soil carbon projects registered Australia-wide, only 18 soil carbon projects have been issued carbon credits

Project details

Marble Hill is a 48-hectare carbon project which began in 2021 and is still on-going. When the project began, the paddocks were made up of acidic clay soils, and pastures showed symptoms of aluminium toxicity. The soil was treated using 100% recycled products that included lime residuals from water treatment plants in Sydney, which were chosen for their calcium content and ability to raise the soil pH. Agri-ash provided the soil with much-needed Phosphorus and paper crumble was added to introduce organics into the soil. All the products used have Resource Recovery Exemptions and Orders granted by the Environmental Protection Authority (EPA). SoilRegen was able to obtain these exemptions by conducting field tests that demonstrated these products have bona fide beneficial use when applied to agricultural soils. The treatments were spread over the topsoil and integrated to a depth of 250mm with a cultiplow.

Results

The pastures have seen almost double the productivity since the soil modifications were implemented. The treatments have increased the soil's pH, soil organic carbon and water-holding capacity, which has not only improved the fertility of the land but also extended the growing season. No fertilisers were required by the paddocks since the initial treatment was applied to the soil. The improvements to the soil have had a direct impact on the improvement of the cattle operations at Marble Hill, with the cattle stocking rate more than doubling since 2021.
Photo taken in 2021 before treatment
  • By-product stockpiles are visible adjacent to the treatment area
  • Previous owner said he had never been able to grow pasture on the scalded area
Photo taken in 2024 after treatment
  • The treatment was applied to the right side only of the fence only
Measuring grass growth of the untreated test strip
Measuring grass growth of the treated test strip
Test strips showing the benefits of liming treatments
  • Different rates of lime residuals treatment were applied to each test strip to help us determine the ideal application rate
  • The paces between test strips were untreated

Photo gallery

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