D2.3 2nd Report on NBS cases implementation and transdiciplinary evaluation in Hungary, Denmark, Netherlands and United Kingdom

This deliverable (D2.3) is the second report on the implementation and transdisciplinary evaluation of the Nature-based Solutions (NBS) cases studied within trans4num. It builds on earlier work reported in Deliverable 2.1 (initial site descriptions and implementation plans) and Deliverable 2.2 (first report on NBS cases and early experimentation). In trans4num, we study innovations in four country sites – Hungary, Denmark, the Netherlands, and the United Kingdom – that contribute to more sustainable nutrient management. These innovations are designed, planned, and implemented at the regional and farm level, on fields and plots. Their significance extends beyond individual farms: they matter for transformation when they are practised by many farmers, across considerable agricultural areas, and when they connect with broader policy frameworks and markets. The second project year (2024–2025) has been devoted to implementing the selected NBS in practice, observing their performance, and engaging with stakeholders to evaluate both opportunities and challenges. This report collects site-specific narratives from each country, using a storytelling framework to connect technical, social, and policy aspects. The aim is to show not only how experiments are progressing, but also how they link to the broader transformation goals of trans4num: closing nutrient cycles, reducing environmental pressures, and supporting resilient agri-food systems.