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Spatial and Temporal Variability of N, P and K Balances for Agroecosystems in China[J]. SHEN Run-Ping1,2, SUN Bo1,2 and ZHAO Qi-Guo1 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). Department of Spatial Information Science, Nanjing University of Information Science and Technology, Nanjing 210044 (China).Pedosphere. 2005(03)