https://repository.sustech.edu/handle/123456789/16894 Sat, 11 Apr 2026 15:34:13 GMT 2026-04-11T15:34:13Z https://repository.sustech.edu/handle/123456789/17184 Allelopathy in Mesquite (Prosopis juliflora): A lausible Factor in Invasiveness and Dominance of the Species Z., Abdalla M.; Abdelhalim, Tilal; T., Babiker A. G.; Y, Fujii Common mesquite (Prosopis juliflora), a Fabaceae, native to South America, was first introduced into Sudan in 1917 to curb desertification. However, the plant has spread and become a weed of national importance and a threat to biodiversity. The present investigation was undertaken at the College of Agricultural Studies, Sudan University of Science and Technology to study allelopathic potentials of mesquite, and activity and persistence of the allelochemicals in soils. In all experiments lettuce (Lactuca sativa L.) was used as a test plant. Powdered mesquite parts including leaves, stems, barks and pods, showed differential effects on lettuce seed germination and seedlings growth. Germination was the least affected. Seedlings growth was affected negatively. The radicle was more sensitive to the toxins than the hypocotyl. Mesquite pods were the most suppressive followed in descending order by bark, leaves and stems. Toxins were active through soil and their persistence progressively declined with time. The results suggest that mesquite parts contain water-soluble allelochemicals and that allelopathy may contribute, considerably, to the invasive nature of the plant and its dominance. Article Fri, 10 Jan 2014 00:00:00 GMT https://repository.sustech.edu/handle/123456789/17184 2014-01-10T00:00:00Z https://repository.sustech.edu/handle/123456789/16900 Optimisation of Chrome Retanning Process to the Garad (Acacia nilotica) Tanned Leather Hassan , Ebtesam A.; Ibrahim , Mohamed T.; A. , Sally K. This study aimed to reduce the environmental pollution generated by chrome (chromium III salts) that result from the tannage processes of leather. It aimed also to encourage the use of a local tannin agent which is known as garad (Acacia nilotica). In Sudan, the majority of traditional artesian tanneries use garad for tanning. Some of the modern and mechanized tanneries use garad in the retannage stage. Twelve pieces pickled cattle hides were treated in pilot drum at speed of 8 rpm. In the experimental trail the pickled hides tanned with 30% garad and retanned with different offers of chrome (1%, 2%, 3%, 4%) followed by 10% garad. The chemical analysis of the leathers viz. for % moisture content, % ash content, % fat and % chrome contents were carried out for the experimental leathers. Physical testing, including thickness, tensile strength, percentage elongation at break, load at grain crack, load at grain burst and shrinkage temperature were measured. The chemical properties of leathers in all trials are found to be quite normal. The shrinkage temperature of experimental leathers for all trials found above 85.4°C and the tensile strength above 103.00 Kg/cm2. article Wed, 01 Jan 2014 00:00:00 GMT https://repository.sustech.edu/handle/123456789/16900 2014-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16904 Effect of Wood Species, Resin level and Pressing time on the Quality of Particleboard Nile , The late Adil Azrag; Nasroun , Tageldin Hussein Particleboards were prepared from three wood species, namely Acacia nilotica ( sunt ) Boswellia papyrifera (gafal ) and Ailanthus excelsa, using three resin levels ( 9, 12 and 15 % ) and three pressing times ( 6, 8 and 10 minutes ). Prior to testing, the boards were conditioned for one week at a temperature of 25° C and relative humidity of 65%. The boards were evaluated by testing the following properties: modulus of rupture, modulus of elasticity, internal bond, water absorption and thickness swelling after two hours and twenty four hours soaking in water. Modulus of rupture (MOR) was highest for Sunt boards with 15% resin level, followed by ailanthus with no significant difference between them. It was lowest in case of Gafal boards and 9% resin level. Modulus of elasticity (MOE), on the other hand, was highest with Ailanthus boards and 15% resin level, and lowest with Gafal boards and 9% resin level. Internal bond (IB) was highest with Sunt boards followed by ailanthus without a significant difference between them and 15% resin level. Water absorption after 2 and 24 hours soaking in water (WA2 and WA24) and thickness swelling (TS2 and TS24) after 2 and 24 hours soaking, showed similar trends. The best boards were those made of Sunt and 15% resin levels, while the worse were those made of Ailanthus and 12% resin level. article Wed, 01 Jan 2014 00:00:00 GMT https://repository.sustech.edu/handle/123456789/16904 2014-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16905 Advances in Dates Culture in Sudan, a comprehensive view Tagelsir I. M. Idris¹ and Hind A. Elbashir², Farouq H. Attahir³ Idris , Tagelsir I. M.; Elbashir , Hind A.; Attahir , Farouq H. This article shed light on production, locations, indigenous cultivars and dates population in Sudan. It covered the current problems regarding culture, pest and diseases and physiological disorders. Advances in technologies, cultivars, capacity building, workshops and seminars were viewed. Highlights were made on date centers of concern in Sudan. On the horizon immediate future challenges were pointed out. article Wed, 01 Jan 2014 00:00:00 GMT https://repository.sustech.edu/handle/123456789/16905 2014-01-01T00:00:00Z