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In replicated field experiments, we applied four treatments consisting of an unfertilized control, and addition of biochar (2.5 t ha-1), nitrogen fertilizer (150 kg N ha-1), or biochar loaded with nitrogen (2.5 t biochar + 150 kg N ha-1). Height and diameter of trees were measured before and five growing seasons after treatment, and increment cores were taken at the end of the study period. The dataset “Annual_rings_10years” contains data for annual rings from each tree five years before treatment (2015-2019) and five years after treatment (2020-2024). Units are 1/100 mm. 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