By Akintoye H. A   Agbeyi E. O   Olaniyan A. B.   in Journal of Sustainable Agriculture

ISSN:1044-0046|26|1|27-37

Haworth Press‎(2005)‎

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By Akintoye H.A.   Kling J.G.   Lucas E.O.   in Field Crops Research

ISSN:0378-4290|60|3|189-199

Elsevier‎(1999)‎

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