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Okalebo, JR ,  Palm, C.A. ,  Lekasi, JK ,  Nandwa, SM ,  Othieno, CO ,  Waigwa, M ,  Ndung'u-Magiroi, Keziah Wairimu ,  [Use of organic and inorganic resources to increase maize yields in some Kenyan infertile soils: a five-year experience] ,  Use of organic and inorganic resources to increase maize yields in some Kenyan infertile soils: a five-year experience