Variation of Soil Bacterial Communities during Lettuce Continuous CroppingJie Hong, Yue Yang, Yi Gao, LianQuan Zhong, QuanMing Xu, XinXin Yi, YiQian Liu and XiuZhi GaoE3S Web Conf., 131 (2019) 01091DOI: https://doi.org/10.1051/e3sconf/201913101091