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International Journal of Soil Science 1 ( 1 ): 64 - 74 , 2006
B. A. Raji and J. O. Ogunwole
International Journal of Soil Science 1 ( 1 ): 33 - 43 , 2006
D .T. Yaro, T. Kparmwang, B. A. Raji and V. O. Chude
International Journal of Soil Science 1 ( 3 ): 171 - 183 , 2006