Effects of Biochar on Ca, Mg and B Uptake of Peach Seedlings Jing Sun, Jiaxi Han, Yingying Huang, Qianhe Jing, Aihui Li and Lijin Lin E3S Web Conf., 136 (2019) 07009 Published online: 10 December 2019 DOI: 10.1051/e3sconf/201913607009