TY - Journal of Ecology and Rural Environment A1 - YANG Li-yang, ZHANG Yong-qing, TIAN Jing, WANG Si-qi T1 - Effect of Grass Covering on Soil Fertility Quality of Apple Orchard in Jixian County Based on a Minimum Data Set Y1 - 2020-03-25 JF - Journal of Ecology and Rural Environment JO - Journal of Ecology and Rural Environment SP - 374 EP - 381 VL - 36 IS - 3 UR - http://www.ere.ac.cn N1 - 10.19741/j.issn.1673-4831.2019.0175 ER -