FACULTY OF AGRICULTURE
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Item Assessment of variation in the fiber characteristics of the wood of vitex doniana sweet and its suitability for paper production(2014-03) Ogunjobi, K. M.; Adetogun, A. C.; Omole, A. O.The study investigated the fibre characteristics and chemical composition of Vitex doniana towards determining its potentials for pulp and paper. Fibre dimensions are of great importance because of the strong correlation between it and the strength properties of wood and paper. Axial and radial examinations of fibre characteristics of naturally grown wood of Vitex doniana were investigated to determine its suitability for paper production. Wood slivers were prepared from slices, introduced into wash bottles containing equal volume (1:1) of glacial acetic acid and 30% hydrogen peroxide and investigated on a Rheichert Visopam microscope. Variations existed in the axial and radial direction of the wood. The mean values of fibre characteristics are: fibre length (1.48mm), fibre diameter (21.9μm), fibre lumen width (12.7μm) and fibre wall thickness of Vitex doniana was 4.9μ. The mean lignin, cellulose and extractive contents were 28.1%, 41.2% and 3.5% respectively. Based on the derived values: Slenderness ratio, flexibility coefficient and Runkel ratio, species of Vitex doniana were considered to be good paper making materials.Item Investigation of pulping potentials of jatropha curcas(2013-10) Ogunjobi, K. M.; Adetogun, A. C.; Soetan, D. O.; Omole, A. O.; Olorunfemi, O.; Odebiyi, J. B.The study investigated the pulping potentials of Jathropha curcas, Samples of sawdust, shaving and splinters were taken at three sampling heights (20%, 50% and 90%) and macerated using glacial acetic acid (CH3COOH) and hydrogen peroxide (H2O2) in ratio 1:1. Result of fibre characteristics showed that mean fibre length ranged from 0.216mm at top 0.243mm at middle and 0.244mm at the base. Mean fibre diameter of sawdust (0.01053mm) was highest followed by 0.01028mm for splint and shaving had 0.01002mm. Highest lumen width was recorded at top. Both sampling height and within sample exhibited. Runkel ratio of less than 1 while Flexibility coefficient compared favourably with other species. This study showed that Jatropha stem can be used as an alternative in pulp and paper industry taking advantage of its appreciable short fibre length and Runkel ratio of less than 1.Item Relationship between mechanical properties of vitex doniana, a lesser known species and implications for utilization(2013) Ogunjobi, K. M.; Adetogun, A. C.; Omole, A. O.; Owoeye, S. O.; Odebiyi, J. B.Relationship between the mechanical properties of Vitex doniana, a lesser known wood species was investigated towards determining its potentials for utilization. Four trees obtained from the free area of Olokemeji Forest Reserve, Ogun State, Nigeria were sampled at butt (50cm above the ground) and at 10%, 30%, 50%, 70% and 90% of merchantable height (MH) The samples were also partitioned into corewood, middlewood and outerwood. Impact Bending (IMB), Modulus of Rupture (MOR), Modulus of Elasticity (MOE) and Maximum Compressive Strength Parallel to Grain (MCS//) were determined. Relationship between the mechanical properties was determined using regression equation. Results showed that Mean IMB, MOR, MOE and MCSS// were 0.69m, 85.4 N/mm2, 6380N/mm2 and 40.8N/mm2 respectively. The best relationship existed between IMB and MCS// (R2 = 0.75) followed by between MOR and MOE (R2 =0.71) while the least relationship (R2 = 0.43) existed between MOR and MCS//.Item Biodegradation of triplochiton scleroxylon K. Schum tectona grandis linn, gmelina arborea roxb, nauclea diderichii linn and terminalia ivorensis A. chev by lenzites palisoti Fr.(Medwell Journals, 2010) Adetogun, A. C.; Oladapo, F. M.; Omole, A. O.; Ogunjobi, K. M.; Adejumo, R. O.Triplochiton scleroxylon, Tectona grandis, Gmelina arborea, Nauclea diderichii and Teminalia ivorensis wood blocks were biodegraded in situ in the laboratory by Lenzites palisoti a white rot fungus. The test blocks were cut into 10x10x20mm and exposed into the infection region of pure culture of Lenzites palisoti for 16 weeks. The test blocks were examined for weight loss at 4 weeks interval. The percentages of weight loss obtained after 4, 8, 12 and 16 weeks of incubation of the test blocks in Lenzites palisoti indicated that decay occurred at a relatively constant rate. After 16 weeks, micro morphological analysis of the decayed wood showed that the action of the cellulolytic enzymes of Lenzites palisoti was restricted to cell wall surface.Item Ergonomics assessments of forestry operations in Omo Forest Reserve, Ogun State, Nigeria(Forests and Forest Products Society, 2010-04) Omole, A. O.; Adetogun, A. C.; Ogunjobi, K. M.Research has been intensified In finding ways of improving tree quality, soil conservation, planting and fertilizing techniques and all other factor affecting tree but man who makes success possible for the forest industry, has received far less attention. It is in view of the above that this study assessed the working environment of a logging crew and saw mill workers in Omo Forest Reserve, Ogun State, Nigeria. 42% of the work force reported that the tools and equipments had effects on their working efficiency. A11 the workers were exposed to noise but only 58% asserted that the noise affected their working efficiency and health. Despite their observations, none of the workers interviewed had ever gone for an auditory test and do not use protective equipment such as ear gear because they were not provide with one. An evaluation of the workers' assessment of their living condition revealed that 42% felt that if was good, 33% very good, 17% excellent and 8% stated that it was fair. The study revealed that the level of awareness by the workers was poor and management of the reserve did not take safely measures into consideration. The management should conduct a regular ergonomic assessment of its workforce towards ascertaining their state of health and awareness on precaution measures and safety regulations should be strengthened. It is expedient that the management finds a way of improving the working condition and interacting regularly with the workers in order to improve their working efficiency and productivity.