Browsing by Author "Ogunsanwo, O. Y."

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Assessment of regeneration potential of Hibiscus sabdariffa L. under established ecosystems in Cameroon
(2012) Anjah, G. M.; Ogunsanwo, O. Y.; Jimoh, S. O.; Forjoh, J. N.; Tsombou, F. M.
Hibiscus sabdariffa is a non-timber-forest-plant (NTFP) that has the potential of producing fibers good in paper-making. Germination and growth potentials of H. sabdariffa under farmland, fallowland, plantation and forest ecosystems were studied. Seeds of H. sabdariffa were sown to assess germination percentage, germination rate, germination time and velocity coefficient on established plots of each ecosystem. Seedlings were randomly selected to measure growth and yield parameters of height, diameter, leaf number, fresh and dry weights. Data were subjected to ANOVA and means separated by LSD at P = 0.05. Values of germination percentage for fallowland (17.5) were significantly different from those of farmland (19.4) and plantation (19.1) ecosystems, while natural forest (18.9) had an interactive significance with farmland, plantation and fallowland. There was no significant difference between germination times among the ecosystems, but the coefficient velocity and rate of germination among the ecosystems were significantly different. There was a significant variation in growth and yield values among the ecosystems. However, only seedlings on farmland and fallowland survived with a survival rate of 96 to 86%, respectively. H. sabdariffa can thus, be sustainably regenerated on farmland and fallowland ecosystems for the extraction of stem fibres for paper-making
Basic practical procedures in wood science
(Green Canopy Consultants, 2010) Ogunsanwo, O. Y.; Omole, A. O.
EVALUATION OF CASHEWNUT SHELL LIQUID (CNSL) AS WOOD
(2003) Adetogun, A. C.; Aina, O. M.; Ogunsanwo, O. Y.
Resistance of three Nigerian hardwoods to decay caused by brown-and white-rot basidiomycetes
(2006) Adetogun, A. C.; Aina, O. M.; Ogunsanwo, O. Y.; Omole, A. O.
Assessment of resistance of untreated and n - hexane extract wood blocks of Afzella africana, Nesogordonia papaverifera end Teclona grandis to decay caused by Fomes lognosus, Lentinus Lepideus and GloephyIlum trabeum using percent weight loss was carried out . The study revealed that the durability of these wood species related primarily to the presence of the extractives in the heartwood. Removal of the extractive from the heartwood increases the susceptibility of the wood species to decay. The weight losses for A. africana were 56.3%, 58.1% and 58.7% for F. lignosus, L. lepideus and G. trabeum respectively. N. papaverifera showed weight losses of 57.2%, 58.3% and 58.9% for F. Iignosus, L. lepideus and G. trabeum respectively while T. grandis decreased in weight by 64.2% 67.4% and 78.2% for L. lepideus, G. trabeum and F.lignosis, respectively.
Species selectivity for charcoal production in three ecological zones of Nigeria
(2012) Eniola, P. O.; Odebode, S. O.; Ogunsanwo, O. Y.; Ajewole, O. I
Several factors influence the quantity of charcoal production in different parts of Nigeria. The study investigated species selectivity for charcoal production in three ecological zones of Nigeria. Data were obtained through the use of structured interview schedule administered to three hundred and twenty seven respondents selected through snowball. The data were subjected to descriptive and analysis of variance. The results show that the mean age of respondents was 44, male (88.1%), primary school leaving certificate (42.2%), married (92.0%), respondents with charcoal production as primary occupation is 41.0%. Mean for years of experience was 13 years and income mean from charcoal per annum was ₦217,336.4. Respondents made use of earth mound method to produce charcoal. Major source of trees for charcoal production is natural vegetation. Mean for number of trees spp. used is 10.6, charcoal yield of trees spp. (mean =7.6), availability of trees spp. (mean =13.2), and emerging trees spp. (mean=7.1). Charcoal is produced in both dry and wet season with average of 16,000kgs/annum. Analysis of variance inferred that there are significant differences between source of trees for charcoal production (F= 3.951), number of trees spp. used (F=173.824), charcoal yield of trees spp. (F=238.062), availability of trees spp. (F= 47.413) and emerging trees spp. (F=208.192). More foresters/environmental extension agents should be employed and equipped to monitor the activities of rural dwellers in the forest. Forest licensing and fees collection must be restructured, re-orgarnised and increased to prevent illegal logging.
Technical efficiency of lumber recovery from high forest tree species in selected sawmills of Southwestern Nigeria
(2011) Egbewole, Z. T.; Ogunsanwo, O. Y.; Omole, A. O.
This study investigates the technical performance efficiency (TPE) of twenty seven sawmills purposely selected and grouped into three classes :small<500ft3/day, medium 501-1000ft3/day and large scale >1001ft3/day based on their production capacities. 243 logs obtained from 20 species of wood sourced from Southwestern Nigeria were examined in 27 selected sawmills using the variables such as wood species, log sizes, shapes and sawkerf, which have direct impact on waste generated from sawn logs and log conversion efficiency. Whereas 135 structured questionnaire was used to obtain information relating to experience of headrig operators, age of machine, number of machine used for sawing operation, hands involved in operation and effective duration of operation while a model multiple factor equation was adopted to determine the over all performance efficiency of the assessed sawmills. The average TPE in the small scale sawmills was 53.41%, medium scale sawmills with 58.79% had the highest performance efficiency while large scale sawmills with 41.94% had the least TPE. The average lumber recovery (%LR) was 53.69%, large-sized diameter logs had the highest %LR of 56.48 and small sized logs had 51.77%. Ondo State had the highest mean %LR of 56.15 followed by Lagos (53.09%) and lastly by Oyo State (51.71%). Variations in log diameter classes had significant influence on %LR, slab volume and dust volume at (p<0.05). Significant correlation also exist between log diameter class and LR (0.853**). Noticeable variation in %LR was observed among the various wood species, Ceiba pentandra had the highest mean lumber recovery %LR value of 58.21% while Nauclea diderichii had the least (47.89%). For appreciable reduction of wood-wastes generated in sawmills, greater use should be made of large sized logs, routine maintenance of machines especially the saw blades is necessary, effort should be made towards inclusion of wood mizer headrig that handles smaller sized los with minimal wastages and obsolete headrig need to be replaced promptly while cognate experience should be a major determinant in the appointment of headrig operators. To avoid genetic erosion, choice of species was left to saw millers’ discretion.