Effect of biochar on soil acidity and aluminum morphology in tea plantations Lian-Wen Qian, Rui-Xue Hu, Xu-Jun Liang and Yi-Xiang Wang E3S Web of Conf., 393 (2023) 02021 Published online: 02 June 2023 DOI: 10.1051/e3sconf/202339302021