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Papers by Lawrence Ogunjimi
Research Journal of Applied Sciences, Engineering and Technology, 2014
This investigation was carried out to study some physical, mechanical and thermal properties of f... more This investigation was carried out to study some physical, mechanical and thermal properties of four cultivars of African date fruits and kernels namely 'digila', 'krikri', 'sukur' and 'trigal'. The properties investigated include length, width, pulp thickness, roundness, sphericity, fruit and kernel mass, true density, bulk density and porosity. Others are angle of repose, static coefficient of friction, crushing strength and specific heat. Average fruit and kernel length of digila, krikri, sukur and trigal cultivars at the moisture contents of 17.
The effect of tropical climate of Southwestern Nigeria and building conditions on the weight gain... more The effect of tropical climate of Southwestern Nigeria and building conditions on the weight gain, feed efficiency and some physiological traits of weaner rabbits have been studied. The study was carried out at the Animal Science section of the Teaching and Research Farm, Faculty of Agriculture, Obafemi Awolowo University, Ile-Ife, Nigeria, (Latitude 07 0 28'N and Longitude 04 0 33'E) during the dry season. The amount of opening (30% and 50%) and building orientations of 45 and 90 degrees (to the direction of prevailing wind) were the parameters considered in determining the effect of environment on the studied traits. The rabbits were fed and watered ad libitum throughout the period of experiment. The amount of feed consumed and weight gain by each rabbit was measured weekly while the rectal temperature and respiration rate were measured twice a week to avoid undue stress on the animals. It was observed that buildings in the tropical climate of the Southwestern Nigeria prod...
International Agrophysics, 2014
Passive aeration co-composting using four mixtures of chicken manure and swine manure at 1:0, 1:1... more Passive aeration co-composting using four mixtures of chicken manure and swine manure at 1:0, 1:1, 3:7 and 0:1 with sawdust and rice husk was carried out to study the effects of co-composting on the physicochemical properties of the organic materials. The experiment, which lasted 66 days, was carried out in bins equipped with inverted T aeration pipes. The results showed that nutrient losses decreased as the proportion of chicken manure in the mixtures decreased for saw dust and rice husk treatments. This indicates better nutrientst conservation during composting in swine than chicken manure. Manure mixtures with rice husk had higher pile temperatures (> 55°C), total carbon and total nitrogen losses, while manure mixtures with saw dust had higher total phosphorus loss and carbon to nitrogen ratio. Composts with rice husk demonstrated the ability to reach maturity faster by the rate of drop of the carbon to nitrogen ratio.
Technovation, 2003
A technical assessment of the services provided by the Ogun-Osun River Basin Development Authorit... more A technical assessment of the services provided by the Ogun-Osun River Basin Development Authority to their host communities was carried out to test and validate some of the problems perceived by the participating farmers and the officials as militating against the development of irrigation projects and other non-water and water services. In-depth interviews were conducted with 100 participating farmers and 50 management and project staff concerning the perceived problems facing the authority. After the survey, follow-up by site investigation of the project areas, review of annual reports, official publications and previous studies was carried out in order to probe some of the results of the surveys. This paper reports on what was learned from both the survey and the follow-up investigation and examines the implication of these findings for cost recovery strategies in large-scale irrigation projects in Nigeria.
Journal of Food Engineering, 2002
Locust bean was found to be a protein rich crop whose seed is processed into local food condiment... more Locust bean was found to be a protein rich crop whose seed is processed into local food condiment ÔiruÕ in Nigeria. To explore the possibility of developing handling and processing equipment for the seed, some engineering properties namely: size, 1000 seed weight, true density, bulk density, porosity, static coefficient of friction on wood, angle of repose, specific heat and cracking force, were studied. At a moisture content of 10.25% (db), seed length varied from 0.80 to 1.20 cm, width from 0.60 to 0.85 cm and thickness from 0.45 to 0.60 cm. One thousand seed weight averaged 0.283 kg with a standard deviation of 0.00264. True density lay between 1098.0 and 1215.7 kg/m 3 , while bulk density was between 538.02 and 565.30 kg/m 3 and porosity was between 51.0% and 53.5%. Static coefficient of friction on wood averaged 0.43 with a standard deviation of 0.021, angle of repose 20.32°with a standard deviation of 1.84 and specific heat 1415.3 J/kg K with a standard deviation of 103.81. Minimum cracking force was obtained by loading the seed along its thickness. This force averaged 174.38 N with a standard deviation of 10.21. These results indicate that a mechanical dehulling process to obtain whole kernel from locust bean seed should be possible.
International Journal of Vegetable Science, 2008
... Effect of irrigation frequency on root water uptake in sugar beet. Plant Soil , 253: 301309.... more ... Effect of irrigation frequency on root water uptake in sugar beet. Plant Soil , 253: 301309. ... View larger version(14K), FIGURE 2. Effects of irrigation interval and mulch on plant dry weight and yield of okra. I indicates standard error of the mean. ...
Food Reviews International, 2002
Small-scale irrigation “Fadama” plays a key role in the economics of Nigeria as a basic source of... more Small-scale irrigation “Fadama” plays a key role in the economics of Nigeria as a basic source of food, income, and employment, especially for women in the “slack” period of rainfed agriculture. A study was undertaken to assess the practice of Fadama irrigation in Oyo and Osun states of Nigeria with a view to better understand the characteristic problems and needs.
Bioresource Technology, 2008
The study was undertaken to investigate the effects of carbon to nitrogen (C:N) ratio and turning... more The study was undertaken to investigate the effects of carbon to nitrogen (C:N) ratio and turning frequency (TF) on the loss of total nitrogen (TN) during composting of chicken litter (a mixture of chicken manure, waste feed, feathers and sawdust) with a view to producing good quality compost. Carbon to nitrogen ratios of 20:1, 25:1 and 30:1 and TF of 2, 4 and 6 days were experimented. The initial physico-chemical properties of the litter were determined. During the composting process, moisture level in the piles was periodically replenished to 55% and the temperature, pH and TN of the chicken litter were periodically monitored. Also, the dry matter (DM), total carbon (TC), total phosphorus (P) and total potassium (K) were examined at the end of composting. The results showed that both C:N ratio and TF had significant (p 6 0.05) effect on pile temperature, pH changes, TN, TC, P and K losses while DM was only affected (p 6 0.05) by C:N ratio. All treatments reached maturation at about 87 days as indicated by the decline of pile temperatures to near ambient temperature. Losses of TN, which were largely attributed to volatilization of ammonia (NH 3), were highest within the first 28 days when the pile temperatures and pH values were above 33°C and 7.7, respectively. Moisture loss increased as C:N ratio and TF increased. In conclusion, the treatment with a combination of 4 days TF and C:N ratio 25:1 (T 4 R 25) had the minimum TN loss (70.73% of the initial TN) and this indicated the most efficient combination.
Agricultural Engineering …, 2008
... Carbon may be lost due to either bio-oxidation, in which carbonaceous materials are lost as C... more ... Carbon may be lost due to either bio-oxidation, in which carbonaceous materials are lost as CO2 (Bishop and Godfrey, 1983; Eghball et ... 2004), or exposure of the piles to direct sunlight which may have accelerated the decomposition and loss of valuable nutrients (Kwakye, 1977 ...
Research Journal of Applied Sciences, Engineering and Technology, 2014
This investigation was carried out to study some physical, mechanical and thermal properties of f... more This investigation was carried out to study some physical, mechanical and thermal properties of four cultivars of African date fruits and kernels namely 'digila', 'krikri', 'sukur' and 'trigal'. The properties investigated include length, width, pulp thickness, roundness, sphericity, fruit and kernel mass, true density, bulk density and porosity. Others are angle of repose, static coefficient of friction, crushing strength and specific heat. Average fruit and kernel length of digila, krikri, sukur and trigal cultivars at the moisture contents of 17.
The effect of tropical climate of Southwestern Nigeria and building conditions on the weight gain... more The effect of tropical climate of Southwestern Nigeria and building conditions on the weight gain, feed efficiency and some physiological traits of weaner rabbits have been studied. The study was carried out at the Animal Science section of the Teaching and Research Farm, Faculty of Agriculture, Obafemi Awolowo University, Ile-Ife, Nigeria, (Latitude 07 0 28'N and Longitude 04 0 33'E) during the dry season. The amount of opening (30% and 50%) and building orientations of 45 and 90 degrees (to the direction of prevailing wind) were the parameters considered in determining the effect of environment on the studied traits. The rabbits were fed and watered ad libitum throughout the period of experiment. The amount of feed consumed and weight gain by each rabbit was measured weekly while the rectal temperature and respiration rate were measured twice a week to avoid undue stress on the animals. It was observed that buildings in the tropical climate of the Southwestern Nigeria prod...
International Agrophysics, 2014
Passive aeration co-composting using four mixtures of chicken manure and swine manure at 1:0, 1:1... more Passive aeration co-composting using four mixtures of chicken manure and swine manure at 1:0, 1:1, 3:7 and 0:1 with sawdust and rice husk was carried out to study the effects of co-composting on the physicochemical properties of the organic materials. The experiment, which lasted 66 days, was carried out in bins equipped with inverted T aeration pipes. The results showed that nutrient losses decreased as the proportion of chicken manure in the mixtures decreased for saw dust and rice husk treatments. This indicates better nutrientst conservation during composting in swine than chicken manure. Manure mixtures with rice husk had higher pile temperatures (> 55°C), total carbon and total nitrogen losses, while manure mixtures with saw dust had higher total phosphorus loss and carbon to nitrogen ratio. Composts with rice husk demonstrated the ability to reach maturity faster by the rate of drop of the carbon to nitrogen ratio.
Technovation, 2003
A technical assessment of the services provided by the Ogun-Osun River Basin Development Authorit... more A technical assessment of the services provided by the Ogun-Osun River Basin Development Authority to their host communities was carried out to test and validate some of the problems perceived by the participating farmers and the officials as militating against the development of irrigation projects and other non-water and water services. In-depth interviews were conducted with 100 participating farmers and 50 management and project staff concerning the perceived problems facing the authority. After the survey, follow-up by site investigation of the project areas, review of annual reports, official publications and previous studies was carried out in order to probe some of the results of the surveys. This paper reports on what was learned from both the survey and the follow-up investigation and examines the implication of these findings for cost recovery strategies in large-scale irrigation projects in Nigeria.
Journal of Food Engineering, 2002
Locust bean was found to be a protein rich crop whose seed is processed into local food condiment... more Locust bean was found to be a protein rich crop whose seed is processed into local food condiment ÔiruÕ in Nigeria. To explore the possibility of developing handling and processing equipment for the seed, some engineering properties namely: size, 1000 seed weight, true density, bulk density, porosity, static coefficient of friction on wood, angle of repose, specific heat and cracking force, were studied. At a moisture content of 10.25% (db), seed length varied from 0.80 to 1.20 cm, width from 0.60 to 0.85 cm and thickness from 0.45 to 0.60 cm. One thousand seed weight averaged 0.283 kg with a standard deviation of 0.00264. True density lay between 1098.0 and 1215.7 kg/m 3 , while bulk density was between 538.02 and 565.30 kg/m 3 and porosity was between 51.0% and 53.5%. Static coefficient of friction on wood averaged 0.43 with a standard deviation of 0.021, angle of repose 20.32°with a standard deviation of 1.84 and specific heat 1415.3 J/kg K with a standard deviation of 103.81. Minimum cracking force was obtained by loading the seed along its thickness. This force averaged 174.38 N with a standard deviation of 10.21. These results indicate that a mechanical dehulling process to obtain whole kernel from locust bean seed should be possible.
International Journal of Vegetable Science, 2008
... Effect of irrigation frequency on root water uptake in sugar beet. Plant Soil , 253: 301309.... more ... Effect of irrigation frequency on root water uptake in sugar beet. Plant Soil , 253: 301309. ... View larger version(14K), FIGURE 2. Effects of irrigation interval and mulch on plant dry weight and yield of okra. I indicates standard error of the mean. ...
Food Reviews International, 2002
Small-scale irrigation “Fadama” plays a key role in the economics of Nigeria as a basic source of... more Small-scale irrigation “Fadama” plays a key role in the economics of Nigeria as a basic source of food, income, and employment, especially for women in the “slack” period of rainfed agriculture. A study was undertaken to assess the practice of Fadama irrigation in Oyo and Osun states of Nigeria with a view to better understand the characteristic problems and needs.
Bioresource Technology, 2008
The study was undertaken to investigate the effects of carbon to nitrogen (C:N) ratio and turning... more The study was undertaken to investigate the effects of carbon to nitrogen (C:N) ratio and turning frequency (TF) on the loss of total nitrogen (TN) during composting of chicken litter (a mixture of chicken manure, waste feed, feathers and sawdust) with a view to producing good quality compost. Carbon to nitrogen ratios of 20:1, 25:1 and 30:1 and TF of 2, 4 and 6 days were experimented. The initial physico-chemical properties of the litter were determined. During the composting process, moisture level in the piles was periodically replenished to 55% and the temperature, pH and TN of the chicken litter were periodically monitored. Also, the dry matter (DM), total carbon (TC), total phosphorus (P) and total potassium (K) were examined at the end of composting. The results showed that both C:N ratio and TF had significant (p 6 0.05) effect on pile temperature, pH changes, TN, TC, P and K losses while DM was only affected (p 6 0.05) by C:N ratio. All treatments reached maturation at about 87 days as indicated by the decline of pile temperatures to near ambient temperature. Losses of TN, which were largely attributed to volatilization of ammonia (NH 3), were highest within the first 28 days when the pile temperatures and pH values were above 33°C and 7.7, respectively. Moisture loss increased as C:N ratio and TF increased. In conclusion, the treatment with a combination of 4 days TF and C:N ratio 25:1 (T 4 R 25) had the minimum TN loss (70.73% of the initial TN) and this indicated the most efficient combination.
Agricultural Engineering …, 2008
... Carbon may be lost due to either bio-oxidation, in which carbonaceous materials are lost as C... more ... Carbon may be lost due to either bio-oxidation, in which carbonaceous materials are lost as CO2 (Bishop and Godfrey, 1983; Eghball et ... 2004), or exposure of the piles to direct sunlight which may have accelerated the decomposition and loss of valuable nutrients (Kwakye, 1977 ...