LIFE CO2SAND: Enhancing sandy soils with clay
In the European sand belt, agricultural soils are increasingly vulnerable to drought and acidification, challenges that are further intensified by climate change. These issues pose significant threats to current agricultural practices and long-term sustainability.
To address these challenges, Rijkswaterstaat and the Province of Gelderland have joined forces for the LIFE CO2SAND project. This initiative seeks to combat soil degradation by applying a thin layer of clay to sandy soils, raising their lutum (fine clay) content to 8%.
By 2027, the project aims to treat 700 hectares of agricultural land, enhancing soil resilience and supporting sustainable agricultural practices. Rijkswaterstaat focuses on improving the sustainability of its large-scale earthworks, while the Province of Gelderland is committed to promoting sustainable agriculture. Together, they are spearheading this innovative pilot project.
The benefits of clay integration
Clay that is often deemed unsuitable for civil engineering projects is frequently used to fill former sand extraction pits. However, this approach overlooks the significant potential of clay as a soil conditioner. When incorporated into sandy soils, clay offers diverse benefits:
- The soil retains water for longer periods, reducing drought stress.
- Nutrient run-off is minimized, preserving soil fertility.
- Agricultural yields improve due to better soil quality.
- Crops benefit from increased nutrient availability.
- Organic material in the soil rises, fostering carbon sequestration.
- Soil biodiversity improves, creating healthier conditions for soil life.
These benefits are being scientifically validated by Wageningen University and Research and Eurofins through experiments at the De Marke experimental farm and other trial fields.
Scaling sustainable soil reuse with the Soil Flow System Model
The Buyer Group Soil Streams is setting new procurement requirements to encourage the high-quality reuse of excavated materials. As part of this effort, LIFE CO2SAND is collaborating with Copernicos to develop the Soil Flow System Model.
This dynamic tool assesses the circular value of excavated clay by connecting it to optimal reuse options. Policymakers, procurement teams, and contractors can use the model during the early stages of project planning to make informed decisions.
The Environment and Planning Act (Omgevingswet) provides opportunities to scale up initiatives like LIFE CO2SAND. The project supports municipalities in developing environmental plans and soil quality maps while exploring methods to extend soil reuse beyond the traditional scope of civil engineering.
Period
July 2021 - June 2027
European programme
LIFE
Project website
Partners
Rijkswaterstaat, Province of Gelderland, European Union, Wageningen University & Research, de Marke experimental farm