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Soil Olsen-P content changing trend and its relationship with phosphorus surplus and crop yield under long-term fertilization in loessial soil region on the Loess Plateau, China
E Sheng-zhe, YANG Zhi-qi, ZENG Xi-bai, WANG Ya-nan, LUO Zhao-xia, YUAN Jin-hua, CHE Zong-xian
Chinese Journal of Applied Ecology . 2017, (11): 3589 -3598 .  DOI: 10.13287/j.1001-9332.201711.037