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ItemRhizobial Cross Inoculation Groups of Faidherbia albida and Acacia spp.(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1993)The study indicated that Faidherbia albida does not belong to the Acacia cross- inoculation group. It showed weak or no response when cross-inoculated with Rhizobium isolates obtained from the root nodules of five Acacia spp., namely A. nilotica, A. senegal. A. seyal, A. tortilis and A. mellifera. This was indicated by none or small number of nodules and lower levels of total nitrogen. Similarly Acacia spp. examined either showed no response (A. nilotica and A. mellifera) or only weak response (A. senegal, A. tortilis and A. seyal) when cross- inoculated with Rhizobium isolated from the root nodules of F. albida. Addition of NPK fertilizer benefited Acacia spp., as it resulted in more root nodules, when it was combined with inoculation with their own Rhizobium isolates, whereas F. albida did not benefit from NPK as far as nodulation was concerned. Both frequency of nodulation and total nitrogen content were maximized when each individual plant species was inoculated with its own isolate of Rhizobium. Control plants remained free of nodules.
ItemAmino Acid Composition and Proximate Analysis of Faba Bean (Vicia faba L.) Seeds(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1993)he proximate analysis of 15 entries of faba bean showed that the moisture content ranged from 5.0% to 7.1%, protein from 27.1% to 35.7%, fat from 1.1% to 1.6%, crude fiber from 5.1% to 7.4%, and ash from 2.7% to 4.3%. The amino acid composition of the seed protein showed that the essential amino acid methionine was present in small quantities, while values for lysine ranged from 5.7 to 6.9 g/16 gN. The results obtained indicated that faba bean entries under study were a good source of fiber and protein with amino acid profile adequate for most of the essential amino acids with the exception of the sulfur-containing amino acids.
ItemPhenotypic and Genotypic Correlation of Some Characters in Faba Bean (Vicia faba L.)(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1993)Twenty-five accessions of faba bean (Vicia faba L.) were evaluated over two years (1998/89-1989/90) in a partially balanced 5x5 lattice design. Data on 17 plant characters were collected. Genotypic and phenotypic correlations between different traits were determined. Grain yield/ plant showed significant positive phenotypic associations with its components; namely, number of podded nodes/plant number of seeds/ pod, number of pods/plant and 100-seed weight. Yield components exhibited significant positive phenotypic and genotypic associations with each other, except number of seeds/pod, 100-seed weight and number of branches/plant, which showed negative associations. Positive significant phenotypic association between grain yield/unit area and grain yield/plant was also observed. The yield components, which had close association with grain yield, could be used as indicators in selection for yield. However, special consideration should be given to the traits, which are negatively associated with each other.