Effects of Chitosan on Soluble Sugar Content in Prunus davidiana Seedlings Jing Sun, Aihui Li, Qianhe Jing, Yingying Huang, Jiaxi Han and Lijin Lin E3S Web Conf., 136 (2019) 06001 Published online: 10 December 2019 DOI: 10.1051/e3sconf/201913606001