By Nel P   in African Journal of Marine Science

ISSN:1814-232X|35|2|195-208

Taylor & Francis Ltd‎(2013)‎

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By Nel P.C.   Barnard R.O.   Steynberg R.E.   de Beer J.M.   Groeneveld H.T.   in Field Crops Research

ISSN:0378-4290|47|1|53-64

Elsevier‎(1996)‎

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