Impact of pyrolysis temperature on phosphorus plant availability in biochar-A pot experiment using <sup>33</sup>P dilution.

This work was supported by the Ministry of Food, Agriculture and Fisheries of Denmark via the Green Development and Demonstration Programme (GUDP), as part of the project “Reduction of greenhouse gas emissions and increased carbon storage in soil through stabilization of solid fractions as biochar (STABIL)” 34009‐20‐1726 The first three sequentially extracted P‐fractions, except bicarbonate‐P in PMF‐derived biochars, showed a significant decreasing trend with pyrolysis temperature, while HCl‐P had a positive trend ( p < 0.05, Table S2 ).

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Among the sequential fractions, WEP and bicarbonate‐P (combined), representing the P fractions readily available to plants (Cross & Schlesinger, 1995 ), showed a decreasing trend with increasing pyrolysis temperature (Figure 1 ).

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However, biochar produced at lower pyrolysis temperatures was more effective as a P fertilizer, as a negative trend was evident in the performance of biochar with increasing pyrolysis temperature (Figure 4 ).

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