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Kimetu, J.M. ,  Mugendi, DN ,  Palm, C.A. ,  Mutuo, PK ,  Gachengo, CN ,  Nandwa, SM ,  Kung'u, J.B. ,  [Nitrogen fertilizer equivalency values for different organic materials based on maize performance at Kabete, Kenya] ,  Nitrogen fertilizer equivalency values for different organic materials based on maize performance at Kabete, Kenya