By Phiri S.   Barrios E.   Rao I.M.   Singh B.R.   in Plant and Soil

ISSN:0032-079X|231|2|211-223

Springer Publishing Company ‎(2001)‎

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By Katanga R.   Kabwe G.   Kuntashula E.   Mafongoya P.L.   Phiri S.   in The Journal of Agricultural Education and Extension

ISSN:1389-224X|13|2|117-129

Routledge Ltd‎(2007)‎

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