cc-by-4.0Pihlatie, Mari2025-04-292023-06-132023-06-13https://datakatalogi.helsinki.fi/handle/123456789/5483This dataset describes labile nitrogen pools following four years of carbon farming experiments in the Carbon Action ACA dataset of 20 farms. The soils were sampled in July and analyzed for Total N, ISNT-N, Autoclave citrate protein -N, Water soluble organic N, inorganic N and potentially mineralizable N.  The analysis is published open access in Soil Use And Management. https://doi.org/10.1111/sum.12930soilnitrogenagriculturedataset