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Research Journal of Agronomy 1 ( 2 ): 88 - 93 , 2007
M.G. Solomon, Paul B.Okon and S.B.A. Umoetok
Research Journal of Agronomy 2 ( 1 ): 12 - 17 , 2008
B.N. Iloba, S.B.A. Umoetok and S. Keita
Research Journal of Applied Sciences 2 ( 4 ): 397 - 399 , 2007