Effects of farmyard manure and inorganic fertilizers on sorghum growth, yield, and nitrogen use in a semi-arid area of Ethiopia von Bayu, W, Rethman, N.F.G, Hammes, P.S, Alemu, G

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Influence of season/year and species on chemical composition and in vitro digestibility of five Indigofera accessions von Hassen, Abubeker, Rethman, N.F.G., van Niekerk, W.A., Tjelele, T.J.

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The influence of tree thinning on the soil water in a semi-arid savanna of southern Africa von Smit, G.N., Rethman, N.F.G.

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Crops can be irrigated with lime-treated acid mine drainage von JOVANOVIC, N. Z, BARNARD, R. O, RETHMAN, N. F. G, ANNANDALE, J. G

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Invloed van stikstofbemesting, grontipe en waterstremming op die produksie en watergebruikdoeltreffendheid van Digitaria eriantha cv. Irene onder glashuistoestande von PIETERSE, P. A, RETHMAN, N. F. G, VAN BOSCH, J

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