The Passivation Effect on Cd of Mixing of Amaranthus chinense L. Straw and Phosphate Rock Powder in Cd Polluted SoilXian Luo, Zheng Zhao, Fafu Deng, Lin Zhu, Haiyan Zhang, Honglin Pu and Yongxia JiaE3S Web Conf., 131 (2019) 01110DOI: https://doi.org/10.1051/e3sconf/201913101110