Analysis of surface phosphorus balance of farmland in Fangshan district, Beijing
ZHANG Hui, GAO Rutai, XIA Xunfeng, JIA Xiaohong, LIU Shuqing, XU Qigong, JIANG Tiantian
Ecology and Environment . 2009, (5): 1949 -1955 .  DOI: 10.16258/j.cnki.1674-5906(2009)05-1949-07

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