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Soil total P and its fractions (organic P, inorganic P, and available P) were determined. Phosphorus uptake and corn grain yield were also evaluated. BBC, regardless of pyrolysis temperature, increased soil total P and all P fractions. Moreover, BBC maintained high soil P contents for at least two years after stopping its application. These results suggest that BBC may act as a slow-release P fertilizer. Surprisingly, soil P fractions were unaffected by different pyrolysis temperatures, but BC 300 promoted higher grain yield than BC 50