Vol. 2, No. 2, 1994
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ItemA Note of the Effect of Rotation on the Persistence of Fusarium exysporum. F. sp. Vasinfectum(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1994)A glasshouse experiment was conducted in the Gezira Research Station (Sudan) between Dec. 1991 and Dec. 1992. The objective was to study the effect of growing Shambat-B (a cotton variety resistant to fusarium wilt), for some time, on the degree of infection of the variety Barakat-82 (a susceptible variety). The results indicated that growing a highly resistant cotton cultivar to fusarium wilt, e.g., Shambat-B, in infective soil for about 10-12 months can, to a great extent, reduce the inoculum potential of the soil.
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ItemA note on Conacarpus lancifoliuss Engl. A Promising Species for Planting in Arid and Semi- arid Regions of the Tropics(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1994)The drought resistant, evergreen "Damas" (Conacarpus lancifolius Engl.) was tried in the early 1960s on the irrigated saline soils of the Khartoum Green Belt. By the end of the 1960s, some trials were started on the alluvial, silty and seasonally flooded "Gerf" soils along the Blue Nile banks, at Hudeibat and Lembwa forest (south of Singa) reserves. In 1981, two permanent sample plots, each of 0.25 ha in size in Hudeibat forest were enumerated. The results indicated that the average annual growth rate was about 23 m3/ha. The measurements of Lembwa forest during 1983, 1984 and 1986 showed that the average annual growth rate was 36 m3/ha. Therefore, it is to obtain an average annual growth rate of Damas of about 30 m3/ha as compared to 15 m3/ ha/year for Acacia nilotica and 23 m3/ha/year for Eucalyptus microtheca. These results indicate that Damas is the fastest growing forest tree in the Sudan, and due to its multiple uses, it is recommended to give more attention to this species in the afforestation projects.
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ItemNatural Regeneration of Heglig (Balanites aegyptiaca L. Del.) on Clay Soil of Central Sudan(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1994)Natural regeneration of Balanites aegyptiaca on clay soil of central Sudan is possible, both by natural seeding (53.3%) and by coppicing (46.7%). Coppicing was 100% irrespective of the stump diameter or height. It is suggested to expand the planting of Balanites to secure steady supply of fruits for the different industries together with availing wood and timber products. Selection of high productive provenances as well as strict protection and conservation measures should be carried out.
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ItemFibre Length Variation of Six Eucalyptus Species Growing in Central Sudan(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1994)Variation in fibre length was studied in six Eucalyptus species (E. camaldulensis, E. cambageana, E. coolabah, E. hybrid, E. tereticornis, and E. wandoo). A three- level cluster sampling procedure was adopted in which three trees were randomly selected from each of the six species; each tree was sampled at three heights, namely 0.3, 2.3 and 4.3 m., from ground level. Fibre length varied significantly among species but not among trees within species or along the same tree. E. cambageana had the longest fibres while E. wandoo and E. coolabah the shortest.
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ItemAn Indicative Assessment of the Productivity Trend of Eucalyptus microtheca Irrigated Plantations in the Gezira Scheme(Faculty of Agriculture, University of Khartoum, Shambat, Sudan, 1994)This study indicates that the productivity of Eucalyptus plantations in the Gezira irrigated scheme may be correlated with irrigation quantity and intervals. A productivity trend as from southern to northern Gezira is shown to have direct relation to water quantity per year.