Effects of acidic phosphorus-rich biochar from halophyte species on P availability and fractions in alkaline soils release_dvpfxoz7qnav3mrtja6pqwksty

by Xuyang Wang, Tao Sun, Haigang Ma, Guangmu Tang, Mo Chen, Maidinuer Abulaizi, Guangling Yu, Hongtao Jia

Published in Chemical and Biological Technologies in Agriculture by Springer Science and Business Media LLC.



<jats:title>Abstract</jats:title>Conditioning alkaline soil with acidic phosphorus-rich biochar might contribute to improving soil phosphorous (P) availability and waste utilization efficiency. In this study, acidic phosphorus-rich biochar was prepared using halophyte biochar (HBC) modified by H<jats:sub>3</jats:sub>PO<jats:sub>4</jats:sub> (P-HBC) and H<jats:sub>4</jats:sub>P<jats:sub>2</jats:sub>O<jats:sub>7</jats:sub> (PA-HBC). The P-containing groups and P fractions in the HBCs were characterized, and the effects of biochar on the P fractions in alkaline soil were examined with incubation experiments. The results showed that the pH of P-HBC (3.31) and PA-HBC (2.17) was significantly reduced compared with HBC, and the total P contents rose to 4.66 g·kg<jats:sup>− 1</jats:sup> and 5.24 g·kg<jats:sup>− 1</jats:sup>, respectively. The spectral characterization confirmed the loading of P-containing and acidic functional groups in the HBCs after modification. The application of P-HBC and PA-HBC in alkaline soils decreased the soil pH and facilitated the transformation of stable P into active fractions. Overall, acidic phosphorus-rich biochar can be employed to increase P activity in alkaline soil. <jats:bold>Graphical Abstract</jats:bold>
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