https://repository.sustech.edu/handle/123456789/16919 2026-04-11T15:27:06Z https://repository.sustech.edu/handle/123456789/16948 Tree Associations in Relation to Ecology in El Suki Area, Sennar State, Sudan Abuelgasim , AbdElfadeel Khalfalla; M , Abdelhafeez A. The first attempt to study the flora of the study area was in 1958, which included in the work of Harrison and Jackson about classification of the Sudan vegetation. The study area was very rich of plant diversity, especially trees, because of the high rainfall.This study is an attempt to investigate and update the associations between the treespecies to know their ecological positions among the vegetation cover.A field survey was conductedin the years 2011 to 2012 at the south-eastern part of Sinnar State for two seasons. Five major transects were taken, each of 3000m length, 10m width in a total area of 150.000m2.Results showed that Acacia seyalis thedominant tree species throughout the study area, with Acacia nilotica and Balanitesaegyptica as ecological associates, because they were abundant, frequent and ofhighdensity, and less diversity in the area in the two seasons article 2015-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16946 Stability of Some Edible Oil Blends Based on Palm Olein Shakak , Mahdi A.; A , A. Rahama; Elfaki , Ahmed E. Palm olein was blended with three Sudanese edible oils namely cottonseed, groundnut, and sunflower oils, at two levels (3:1; 1:1, respectively), to evaluate the effect of these oils on palm olein stability during storage and as influenced by the frying process. The viscosity, color, refractive index (R.I), free fatty acids (FFA), peroxide value (PV), polymer content (PC) and iodine value (IV) of the blends were monitored during both storage intervals of 0, 3, 6 and 12 months, and exposure to frying temperature at 180 ± 20C for 5, 10 and 15hrs. During storage of the palm olein blends for 12 months, it was found that the degradation of the triglycerides of palm olein blends 1:1 mixing level into FFA particularly of groundnut oil blends was significantly (P?0.05) higher than the pure palm olein (6.51 and 4.30%, respectively). However, the FFA of palm olein blends of cottonseed oil and sunflower oil at high olein level (3:1) showed no significant (P?0.05) changes compared to the pure palm olein. The stability of palm olein containing conventional oils has significantly (P?0.05) decreased with all blends, as shown by high level of peroxides (PV above 15 meq.O2), compared to the pure palm olein (9.17 meq.O2). The polymer formation in all palm olein blends of 1:1 ratios has significantly (P?0.05) increased (PC ranged between 6.13 and 8.00%) compared to the pure palm olein (3.8%). After 15 hrs of exposure to frying temperature, palm olein blends containing low level of Sudanese oils were more stable as shown by less split in FFA (2.59%) compared to higher ones in high level of these oils in olein (3.34%).Similarly, the formation of peroxides was lower during frying of olein of low blending level (PV ranged between 8.06 and 8.80 meq.O2) compared to the one containing high level of Sudanese oils (10.44 to 14.19 meq.O2). Equally, the formation of polymers was faster and higher in high blending levels (PC ranged between 5.84 and 7.44%) compared to lower levels (3.84 to 5.42%). article 2015-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16949 Effect of Sowing Date and Nitrogen Fertilizer Rate on Yield of Sorghum (Sorghum bicolor L.) and Nitrogen Use Efficiency D , Azrag A.A.; I , Dagash Y.M .; O , Yagoub S. A field experiment was conducted at the College of Agricultural Studies, Sudan University of Science and Technology in Khartoum (Shambat), during two summer seasons 2011/2012 and 2012/2013, to study the effect of Sowing date and Fertilizer rate on growth of Sorghum (Sorghum bicolor L.). The cultivar used was Wad Ahmed. The experimental design used was split- plot arrangement ( a randomized complete block design (CRBD) with three replications. The main plots were four Fertilizer rate control (No), 45kg/ha (N1), 90kg/ha (N2) and 135kg/ha (N3), subplots were four sowing date on 1 st July (s1), 15 th July (s2), 1 st August (s3) and 15 th August (s4). Yield components which studied were length of head, seed weight /plant, 100. Seed weight, grain yield, harvest index and nitrogen use efficiency. The general trend was that sowing date had significant effect on harvest index in both seasons, grain yield in season one, length of head and 100. Seed weight in season two .Generally application of fertilizer resulted in significant effect on grain yield and nitrogen use efficiency in both seasons article 2015-01-01T00:00:00Z https://repository.sustech.edu/handle/123456789/16947 Influence of Rate and Time of Application of Nitrogen Fertilization on Yield and Quality of Two Wheat Genotypes Ali , Sahar O. Ahmed; El hashmi , Ashraf M. A. Field experiments were conducted at Hudeiba Research Station farm, River Nile state, for two seasons (2007 –2009) to assess grain yield and quality of two wheat genotypes as affected by different nitrogen fertilization recipes. Nitrogen fertilizer comprised four rates (0 kgN/ha, 43 kgN/ha, 86 kgN/ha and 129 kgN/ha) applied at different stages of growth (tillering, booting and heading) and the two wheat genotypes (N5732/HER//CASKOR and Bohain) Experiments were arranged in a split-plot trail where the nitrogen fertilizer treatments were in the main plots and wheat genotypes in the sub-plots. Combined analysis for the two growing seasons (2007/08 and 2008/09) revealed that N- fertilizer treatments significantly affected yield and yield components of wheat. However, slightly higher yield was obtained at 86kgN/ha at Tillering+43kg.N/ha at Booting (T7) and 86kgN/ha at Booting+ 43kg.N/ha at Heading (T10) relative to the other treatments. High protein and gluten contents were obtained when N-fertilizer applied at 86kg.N/ha rate at booting and 43kg.N/ha at heading stages. Generally genotype (N5732/HER//CASKOR) showed relatively better quality attributes when compared with Bohain, particularly protein and gluten contents article 2015-01-01T00:00:00Z