النشر العلمي

  • Effect of plant spacing on growth, yield and fruit quality of some introduced banana clones . M. E. Elkashif, O. M. Elamin and L. H. Hag Ahmed

A field experiment was conducted at the Experimental Farm of the National Institute for the Promotion of Horticultural Exports, University of Gezira, Sudan during 2009  to 2011. The objective of the study was to determine the effects of plant spacing on the vegetative growth, crop earliness, yield components, total yield and fruit quality of  five introduced banana clones under Gezira conditions, Sudan. Treatments consisted of three banana clones introduced from Austria, namely, Williams hybrid 172 (WH 172), Williams hybrid 1366 (WH 1366) and Grand Nain 1824 (GN 1824) and two clones introduced from South Africa, namely, Zelig and Bio. These five introduced clones were compared with the local clone Dwarf Cavendish (DC). Plant spacing treatments were 2x2, 2x3 and 3x3 m. Treatments were arranged in a split plot design with three replicates. Plant spacing was assigned to the main plots and clones to the subplots. Results showed that vegetative growth parameters, yield and yield components were significantly affected by banana clones and plant spacing. Generally, the introduced banana clones had more vigorous vegetative growth than the local clone DC. The most vigorous vegetative growth was obtained by WH 172 followed by WH 1366 and GN 1824. Plant spacing of 2x3 m and 3x3 m resulted in significantly higher growth parameters values than 2x2 m. The earliest clone was GN 1824 and the latest were Bio and DC. Bio clone took the longest time from shooting to harvesting and both WH clones and Zelig  took the shortest. Plant spacing of 3x3 m resulted in significantly the shortest time from shooting to harvesting compared to the others. The highest yield and yield components were obtained by WH 172, WH 1366 and GN 1824 and the lowest were obtained by the local clone DC. Plant spacing of 3x3 m resulted in the highest yield components but the lowest total yield. However, the close spacing of 2x2 m produced the lowest yield components but the highest total yield due to the large number of bunches per unit area. Total soluble solids were comparable in all clones, however, GN 1824 and WH 1366 had a better taste than the other clones. Plant spacing of 2x3 m and 3x3 m resulted in significantly higher TSS and taste values than 2x2 m.

 

 

 

published in Gezira J. of Agric. Sc.13 (2): 128-144 (2015)

  • Effects of Ethrel, packaging and waxing on degreening, quality and shelf life of sweet oranges

  Post harvest handling practices of sweet oranges are very poor in the Sudan and result in great losses. Oranges grown in central Sudan reach the ripe stage while they are still green in colour. The lack of orange colour development is due to the relatively high temperatures in this region. Therefore, the objective of this research was to find out the effects of Ethrel, packaging and waxing on sweet orange degreening, quality and shelf life. Experiments were conducted at the Faculty of Agricultural Sciences, University of Gezira, Wad Medani, Sudan, during the seasons of 2013-2014. Ripe, green oranges were treated with Ethrel at two concentrations: 1ml/l, 2ml/l or left untreated as a control. Packaging treatments consisted of wrapping oranges in intact or perforated polyethylene film, waxed or left unpackaged as control. Treatments were arranged in a completely randomized design with two replicates. Results showed that treatment of oranges with Ethrel at both concentrations significantly resulted in degreening of oranges and development of a uniform orange colour as compared to the control. Oranges packaged in intact polyethylene film or waxed recorded the minimum weight loss followed by those wrapped in perforated film, whereas the highest weight loss was recorded for the unpackaged and unwaxed oranges. Also, packaging in intact film or waxing of oranges resulted in the longest shelf life compared to the other treatments. Total soluble solids and vitamin C contents were highest in oranges packaged in intact film or waxed, whereas the least contents were recorded for the control. Ethrel treatment had no significant adverse effects on orange chemical composition. It is recommended to degreen oranges using Ethrel at 2ml/l and package them in intact polymeric film or coat them with wax.

 

published in Gezira j. of agric sci. 13 (2): 108-127(2015)

  • Physical injury reduction in mango fruit using improved harvesting methods

          The traditional method of harvesting mango fruit in the Sudan is done by snapping the fruits by a hook attached to a long pole. The drop of fruits to the ground causes bruises and injuries to the fruits, making them unattractive and unmarketable with a short shelf-life. An experiment was conducted in a private orchard along the Blue Nile bank, Gezira State, Sudan, during the seasons 2012 and 2013. The objective of this work was to find out the effects of an improved picking pole and fruit receiving treatments on the reduction of harvest losses in fruits of three mango cultivars. Treatments consisted of three mango cultivars, namely, Abu Samaka, Alphonse and Kitchener, two types of picking poles; the traditional picking pole and improved picking pole and four  treatments: The fruits were dropped directly on the ground (control), fruits were received on either a stretched sheet of cloth, a sponge mattress or a long tapering plastic mesh sleeve fixed to a ring attached to the picking poles. Treatments were arranged in a split-split plot design with three replicates. Cultivars were assigned to the main plots, picking poles to the sub-plots and receiving treatments to the sub-sub plots. Results showed that the improved picking pole resulted in significantly lower weight loss as compared to the traditional picking pole. The cultivar Abu Samaka showed significantly higher weight loss as compared to the other two cultivars. The highest percentage of weight loss was obtained when the fruits were allowed to fall directly on the ground (control), followed by the sheet of cloth and finally sponge mattress, whereas the long sleeve treatment resulted in the lowest weight loss. The improved picking pole resulted in the lowest physical injury, while the traditional picking pole resulted in the highest. 

published in Gezira j. of agric sci. 13 (2): 92-107(2015)

  • Investigation of Gateway Placement Optimization Approaches in Wireless Mesh Networks Using Genetic Algorithms

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published in International Conference on Computer and Communication Engineering (ICCCE), 2014

  • Efficiency of Selected Sudanese Cattle Markets: Multivariate Cointegration Approach (1995-2011)

The importance of the livestock trade to the national economy of Sudan is significant; however, Sudan was
adversely affected by the global crisis through a decline in oil and other external receipts. The main objectives
of this study is to investigates price movements among important livestock markets in the Sudan to explore their
performance and pricing efficiency. The stationarity of data tested using the unit root test and then market integration
was tested using multivariate cointegration analysis. The study found that most cattle markets were integrated with
each other, which showed the co-movement of prices, and this indicates market efficiency in sense that efficiency
means existent of integration and cointegration of market prices. The prices of Omdurman cattle market has effect
on all cattle markets in Sudan in short and long run.

published in International Journal of Economics & Management Sciences

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