Updates from the Archipelago Sea Basin: How Soil Amendments Shape Soil Structure
Researchers from Natural Resources Institute Finland (LUKE), coordinating partner of the Archipelago Sea Basin demo-region, have published a new scientific article in Geoderma, exploring how different soil amendments affect the structural dynamics of clay soil, with important implications for nutrient loss and water protection.
What was studied?
The study followed the structural dynamics of field-incubated clay soil samples from the Savijoki catchment, located within the Archipelago Sea Basin, treated with three soil amendments: gypsum, structure lime, and pulp mill sludge. Using time-lapse imaging with X-ray tomography, researchers tracked changes in the soil macropore system over a one-year period under real field conditions in a boreal climate.
What did they find?
Gypsum and structure lime did not notably influence the macropore structure dynamics compared to the untreated control. Pulp mill sludge, however, told a different story: it significantly altered the macropore system, increasing the volume of large macropores while temporarily decreasing smaller macroporosity after field incubation began.
The results confirm that soil amendments can influence the soil macropore system, not only the structural stability, which is their most commonly recognised benefit, but that the magnitude and nature of these effects strongly depend on the amendment type.
What's next?
The dataset and methodology developed in this study provide a significant foundation for further research into how soil amendments can be best targeted to improve nutrient management and reduce nutrient losses from agricultural fields into sensitive water catchments like the Archipelago Sea Basin.