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Nitrogen and phosphorus balance analysis of cultivated land in Jiangsu plain,China[J]. ZOU Xinqing, Pierre Gerber, LI Haiyu, LIU Qingsong, WANG Qian, SHEN Jingfen & SHI BinwenDepartment of Urban and Resource Studies, Nanjing Univeristy, Nanjing 210093, China;Food and Agriculture Organization. Chinese Science Bulletin. 2001(S1)