Vol. 3, No. 2, 1995

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    A Note on the Processing and Characteristics of Mango Yoghurt
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) Khidir, T. ; Mekki, H.
    A study was undertaken to incorporate mango pulp into the recipe of yoghurt as a new dairy product. Different concentrations of mango flesh were used; namely, 6%, 8% and 10%, and 3% sugar was added to each concentration before mixing with whole milk. The resulting yoghurts were stored at 10°C, and were organoleptically evaluated and were analysed for Physiochemical properties every two days for eight days. Storage did not affect total solids, protein, fat and total sugars at the three mango concentrations except total solids in the 8th day of storage in 8%. But, total acidity increased as the storage period advanced. The pH values showed a non- significant decreasing trend with increase of storage period. It is concluded that mango pulp could be used in fruit yoghurt preparation up to 10%, with improved nutritive value.
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    A Note on Natural Regeneration of Ziziphus spina-christi (Linn.) in Northern Gezira
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) El Nour, M. ; Hussein, N. M. ; Osman, K. A.
    A study was carried out along the western bank of the Blue Nile in north Gezira to determine the extent of natural regeneration of Ziziplus spina-christi (Linn). An area of 5.3 ha, located on the "Gerf" slope, was chosen for the study, and ten plots, 25 x 25m, were randomly selected. The number of trees of seed origin, coppice and sprouts were counted in each plot. The results indicated that natural regeneration of Z. spina-christi is successful along the Blue Nile "Gerf" and "Gerf" slope, mostly by sprouts (75%), followed by natural seeding (22%) and few coppices (3%).
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    Variation in the Specific Gravity of the Wood of Eucalyptus microtheca Provenances in Central Sudan
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) Abdelgadir, A. Y. ; Mahmoud, A. E.
    The purpose of this study was to investigate the variation in wood specific gravity among eighteen provenances of Eucalyptus microtheca grown at two sites, namely Wad-Medani and Assalaya. The trees were grown in three replications in each planting site. The experimental material consisted of wood samples from 1620 trees. A mixed model was used to analyse the variation pattern. Differences in wood specific gravity were significant between sites. Genetic variation associated with provenances was also significant, indicating that progress can be made for this trait by selection between provenances. The ranking of provenances was consistent for both sites. Provenances from the northern part of Queensland were at the top of the ranking groups and provenances from New South Wales were ranked at the bottom.
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    Pre-germination Treatments of Ziziphus spina-christi (Linn.) Seeds
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) El Nour, M. ; Hussein, N. M. ; Osman, K. A.
    A laboratory experiment was conducted to determine the suitable methods for enhancing germination of Ziziphus spina-christi (Linn.) seeds of two different provenances (Um-Syala and Nyala). Five seed treatments were used, namely, soaking in sulfuric acid (98% and 40%); soaking in tap water; plunging in boiling water followed by soaking in tap water; boiling in water followed by soaking in tap water; and mechanical scarification. The results indicated that sulfuric acid treatments gave the highest germination (P£0.05), followed by seed gun scarifier, while water treatments (tap and boiling) did not enhance germination compared to untreated seeds. For both provenances, boiling in water for 5 or 10 minutes was lethal.
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    The Effect of Tree Locust Defoliation on Gum Arabic Production by Hashab Trees (Acacia senegal) in the Sudan
    (Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1995) El Atta, H.A ; El Bashier, E. M.
    Defoliation of hashab trees (Acacia senegal) by the tree locust (Anacridium melanorhodon melanorhodon) had significantly (P<0.01) reduced gum arabic yield. Mean gum yield per tree was 96.64, 18.58, 11.64, 6.32 and 11.83 g in the control, light, medium and heavy locust defoliated and artificially completely defoliated trees, respectively, in season 1991. These reductions were significant (P<0.01). Gum yield was inversely correlated (r = -0.88) with the intensity of locust defoliation. These results were confirmed in season 1992 where mean gum yield was 85.6, 19.6, 9.4, 4.9 and 11.0 g/tree in the control, light, medium and heavily locust defoliated and artificially completely defoliated trees, respectively. Loss in gum yield was negatively correlated (r = -0.89) with the intensity of defoliation.