Tumbleton Soil Carbon Project

Tumbleton Soil Carbon Project is a measurement and models soil carbon project located at Tumbleton Lane near Young in the Hilltops local government area of New South Wales, situated approximately two hours' drive northwest of Canberra. It was registered in April 2024 and initially covered an area of 1,144.12 hectares, though a project variation was processed in August 2025 where some listed areas were removed from the project boundaries.

Measurement and models soil carbon projects operate under the Carbon Credits (Carbon Farming Initiative-Estimation of Soil Organic Carbon Sequestration using Measurement and Models) Methodology Determination 2021. This methodology credits the increase of carbon stored in agricultural soils by estimating sequestration through direct physical soil sampling and/or modelling. It requires proponents to implement one or more eligible new agricultural activities, such as modifying grazing practices, adding nutrients, or converting to pasture, to improve soil health and build organic carbon levels over time.

The surrounding South West Slopes region of New South Wales is highly productive and well-known for its mixed farming, sheep grazing, and renowned horticulture, with the town of Young famously dubbed the "Cherry Capital of Australia". The region experiences a temperate, Mediterranean-style climate with hot, dry summers and cold, wet winters, recording an average annual rainfall of approximately 600 to 650 mm. The local landscape predominantly features rolling hills with diverse soils, typically consisting of sandy loams, red earths, and texture-contrast soils (such as Chromosols and Sodosols) often formed from granodiorite parent rock.

At Tumbleton, the project proponents are implementing these methodology requirements by altering the stocking rate, duration, and intensity of grazing to improve soil health and promote continuous vegetation cover. The project will also actively apply nutrients to the land, in the form of a synthetic or non-synthetic fertiliser, to address material deficiencies in the soil. The project is managed by Bruce Wilkinson, Gemma Ingle Wilkinson, Jacob Chandler, and Tracey Anne Wilkinson, with assistance from project agent Carbon Link Operations Pty Ltd.