Theses and Dissertations Abstracts

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Theses and Dissertations

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Open Access
The Nigeria University adult education and the Nigerian national development:The opinions of four selected groups
(Department of Adult education, Faculty of Education, Obafemi Awolowo University, 1977) OBANEWA, Olaitan
To identify the opinions of four selected groups - professors, readers, senior lecturers and chief education officers toward each of the 1957/76 session adult education program objectives in Nigerian universities' departments of adult and continuing education in terms of their relevance to the attainment of the third Nigerian national education development objectives.
Open Access
The Influence of Educational Television on Instruction in selected secondary schools within Kaduna State
(Department of Educational technology Obafemi Awolowo University, 1982-06) Amina Isu Ijagi
This study was undertaken to assess the influence of educational television on instruction in selected secondary schools in kaduna State. The focus of the study was to find out ; the attitudes of teachers and students towards the utilization of Etv; the relationship between Evt programme content and school subject content ; the quality of Etv programme content as perceived by the teachers; and the problem inhibiting the effective utilization of Etv.
Open Access
Determination of The Optimum Weight/age and Composition of Broiler in Tropical Environment
(Obafemi Awolowo University, 1984) Williams, Adebayo R.
In a study to determine optimum slaughtering age of broilers in Nigeria, 605 Cobb broilers were raised on floor pens, The birds were weighed weekly and 2 birds/pen were slaughtered fortnightly from six to sixteen weeks. Body weight, carcass weight, abdominal fat thickness and fat weight were measured. Internal body fat was determined by ether extraction of homogenised whole carcass less bone. Twoway analysis of variance, simple and multiple regression and correlation analysis were carried out. Data on costs, revenue and net returns were obtained by questionaire survey of poultry farms around Ile--Ife. The data were summarised and analysed graphically. Body weight, carcass weight, abdominal fat weight, abdominal fat weight as % live weight, abdominal fat thickness, total body fat, %total body fat, internal body fat and internal body fat as carcass weight were significantly affected by sex and age (P <0.01). Feed efficiency and feed conversion ratio were significantly affected by age (P <0.01).Highly significant correlations (P <0.01) were obtained among all body traits. Highly significant regression coefficients (P <0.01) were obtained by simple regression of internal body fat on carcass weight,body weight abdominal fat weight and fat thickness, Multiple regression analyses showed that, the regression was im--including fat thickness after abdominal fat weight and . fat weight after carcass weight, Total body fat prediction can be reliably based on carcass weight abdominal fat weight for broilers between 6 -16 weeks. Economics analysis revealed that profit is made when broilers till 16 weeks. When broilers are sold at a fixed price, the n point of slaughter is close to 12 weeks, but when broilers on weight basis, the optimum marketing age is just above and the physiological body data showed that fat deposition above after 12 week
Open Access
Establishment of Some Pharmacopoiel Standards for Catharanthus Roseus (L.) G. Don and Voacanga Africana Stapf.
(Obafemi Awolowo University, 1984) Soleye, Adetayo Oluwatoyin
Catharanthus roseus (L.) G. Don. contains the antineoplastic alkaloids: vinblastine and vincristine while Voacanga africana Stapf. possesses cardiotonic activities due to it s content of alkaloids like voacangine and voaphylline. Before they can be included into the proposed African pharmacopoeia, certain pharmacognostical standards as well as macro- and micro- morphological features of the leaves of these plants are required. A literature review of the phytochemical investigations of these two plant drugs is presented. Reports on some pharmacopoeial standards, e.g. ash values, yield to solvent, total indole alkaloid content which are to be included in the African pharmacopoeia are presented with recommendations on the procedure for determining whether commercial crude drug samples of these plants comply with the limits recommended. Macro- and micro- morphological features are also given in the monographs presented on Catharanthus and Voacanga african
Open Access
Pollution pattern in the Mokuro dam in Ile-Ife
(Microbiology, Obafemi Awolowo University, 1984) Petters, Hannah Itam
distribution system were carried out from December 1982 to November 1983 at monthly intervals, and the quality of water was assessed to establish the pollution pattern. Generally, the population density of aerobic heterotrophic bacteria varied between wet and dry seasons., While thorn was an increase in the mean monthly population of bacteria from 4.2 x 102/ml in November to 4.8 x 106/ml in February (i.e. dry season) there was a comparative decrease from 11.0 x 106/ml in June to 1.8 x 103/ml in October (i.e. rainy season), in the distribution system In the stream and in the dam, the seasonal trends of total aerobic bacterial distribution followed more or less the same pattern as in the distribution system. In the dam, the faecal coliform populations ranged from zero to 33 MPN/100 ml during the rainy season and from 2 to 221 MPN/100ml in the dry season. The same pattern was observed in the distribution system. Both faecal streptococci and Clostridium perfringens were also detected in the water samples with no definite pattern of population distribution between the seasons. The mean monthly faecal streptococci ranged from zero to 2.8 x 10 4/mt, while Clostridium perfringens ranged from zero to 538 MPN/100ml. Nitrate, phosphate, chloride and dissolved solid levels were generally low. These compounds ranged from zero to 1.16 mg/l; from zero to 0.038 mg/I, from 3.6 to 54 mg /l, and from 0.0001 to 0.058 g/100ml, respectively. The BOD varied with a range of 1.0 to 12.6mg /l in the dam. In the distribution system, the chlorine residual was generally below 1mg/l, decreasing with distance away from the chlorination point.
Open Access
The case of Semantic Ambiguity: English usage in Nigerian politics
(Obafemi Awolowo University, Ile Ife, Nigeria, 1984) Yusuf, Yisa Kehinde
This thesis is an attempt at examining the significance of semantic ambiguity to communication. The work is based on data collected from the political events which occurred and the speeches that were made during the Nigerian Second Republic (1979 - 1983). The semantic analysis of the data has been done largely in terms of Componential Analysis. The thesis reviews the theoretical and attitudinal controversies surrounding the concepts of semantics and semantic ambiguity. It also examines the implications of these controversies for a study on communication in an L2 medium in politics. The work also establishes that the complexity and dynamics of the relationship that exists between language and reality make the occurrence of semantic ambiguity a linguistic inevitability. It further characterizes second-language-induced cases of the semantic phenomenon, and reveals that though the occurrence of semantic ambiguity does not discriminate between L1 and L2 situations of the use of a language, the incidence of the semantic feature is higher in an L2 situation. The work suggests that the moral characterizations of semantic ambiguity should be deemphasized in linguistic studies, as such characterizations more properly belong to the discipline known as Ethics. It reveals that rather than being a linguistic aberration, semantic ambiguity is a linguistic normality which, moreover, constitutes a linguistic facility. Finally, the thesis highlights two potential areas for further research: (1) the semantic structure of contradiction in the 'interlanguage' of L2 users of English who have Nigerian languages as their L1s (2) the socio-cultural determination of logic in meaning
Open Access
Establishment of Some Pharmacopoiel Standards for Catharanthus Roseus (L.) G. Don and Voacanga Africana Stapf.
(Obafemi Awolowo University, 1984) Soleye, Adetayo Oluwatoyin
Catharanthus roseus (L.) G. Don. contains the antineoplastic alkaloids: vinblastine and vincristine while Voacanga africana Stapf. possesses cardiotonic activities due to it s content of alkaloids like voacangine and voaphylline. Before they can be included into the proposed African pharmacopoeia, certain pharmacognostical standards as well as macro- and micro- morphological features of the leaves of these plants are required. A literature review of the phytochemical investigations of these two plant drugs is presented. Reports on some pharmacopoeial standards, e.g. ash values, yield to solvent, total indole alkaloid content which are to be included in the African pharmacopoeia are presented with recommendations on the procedure for determining whether commercial crude drug samples of these plants comply with the limits recommended. Macro- and micro- morphological features are also given in the monographs presented on Catharanthus roseus and Voacanga africana,.
Open Access
The role of foreign private investors in the industry development of Nigeria: A test case of "X" breweries limited
(Obafemi Awolowo University, Ile Ife, Nigeria, 1984) Yusuff, Oyindunla, F.
Most developing economies seek to industrialize as a way to reduce excessive reliance on the agricultural section which is vulnerable to adverse economic conditions. The industrialization pattern is to sponsor programmes promoting the indigenous manufacture of import substitutes. This pattern often involves both local and foreign investment of capital and technical know-how, which invariably is supplied by foreign partners. The beer industry in Nigeria deserves attention because of its recent phenonemenal expansion. There was only one brewery in 1949, producing barely half-a-million hectoliters of lager beer per annum. By 1982 there were twenty-three breweries capable of producing fourteen million hectoliters per annum. This study examines the involvement of some foreign private investors in a new brewery project, in partnership with an indigenous entrepreneur. Foreign participation in industrial ventures in Nigeria takes two principal forms, provision of technical know-how and management, and equity contribution. These forms are examined in relation to the test case. The study also examines the local sources of funds for 1. The identities of the indigenous entrepreneur and the foreign investors involved are not disclosed in accordance with an undertaking given to them industrial activities. Finally, a forecast of the future of the beer industry is made in terms of the investment opportunities in the form of technical knowhow or equity contribution, or both.
Open Access
Status of media in teaching physics in selected secondary schools in Kaduna state, Nigeria
(Obafemi Awolowo University, Ile Ife, Nigeria, 1984) Pearce, Nathaniel Olugbolahan
This study was designed to examine the availability, utilization of media for instruction and the problems connected with the use of media for teaching physics in Kaduna State of Nigeria. Questionnaire, structures interview end participant observer scheme directed to the physics teachers, and randomly selected secondary schools students in Kaduna State were used for the collection of the data. The study population comprised seventeen physics teachers and two hundred and eighty-one form five physics students. Based on the analysis of the data collected, some of findings were that; a) Teachers in the schools used mainly the recommended textbooks for their teaching. (b)There was low utilization of instructional media. (c) Physics teachers like other teachers in the state did not seize the unique opportunities of their proximity to the available resource centres to aid them in the selection and use of media for their teaching. It is therefore recommended that; (a) Educational media centres should be established in all the local.government education offices which will cater for all the schools in the locality. The centres should cooperate with the Federal Government media centres such as the National Educational Research Centre (N.E.R.C), National Teachers' Institute (N.T.I), Radio and Television Education Broadcasting Departments and the Centre for Educational Technology (C.E.T) of the Ahmadu Bello University for professional expertise. (b) Teachers in schools should be trained in the use of media. (c) Local production of science instructional materials should he considered as means of combating the present inavailability of media. (d) The government should reinforce their priority for science teaching in the schools through the timely provision of needed science equipment and materials.
Open Access
The native administration Police forces of Western Nigeria, 1905-1951
(Obafemi Awolowo University, Ile Ife, Nigeria, 1984) Rotimi, Emmanuel Olukemi
Much has been written or native administration in colonial Nigeria. But so far, no work exists on an situation that was very vital to sustaining the system the police. This work bridges the gap by examining the origin, development and. role of Native Administration Police in Western Nigeria from 1905 to 1551. The study begins with an examination of the colonial exigencies which made the establishment and. maintenance of police forces by native administrations in Western Nigeria necessary and permissible. The first two forces were those of Abeokuta and Ibadan which emerged between 1905 and 1907. The process; of establishing more of the forces in other parts of Western Nigeria is further examined in chapter two Before 1939, the forces were poorly organized; recruitment into them was based more on patronage than on. merit; recruits were not exposed to any formal training; and the Native Authorities which controlled .the forces had little or no idea of running the police. Chapter three examines reforms that were undertaken after 1939 in the recruitment, training and control of the forces. These reforms were, however, limited because they were not allembracing and were not comprehensive. The role of the policemen is examined in chapter four. Throughout the period under consideration, the Native administration Police Forces were organized to maintain law and order, a role that was meant to serve the interests of the colonial masters and their local collaborators called Native Authorities, often at the expense of members of the public who were usually humiliated, abused and brutalized, The study is concluded with a summary and a survey of the organisation of the forces in the years after 1951.
Open Access
Comparative Study of bread-baking Operations in the Cross-River and Ogun States.
(Obafemi Awolowo University Department of Agricultural Economics, 1984) Umoh, Patrick
The study examined bread production with emphasis on volume and efficiencies in two states - Ogun and Cross River. Fifty-three bakeries, two flour mills and the Unife Food Science Department were interviewed. Each bakery was classified on the basis of its total fixed investments valued at their original costs. Very few firms operated with highly mechanized implements approaching those firms found in advanced countries. Most firms started with simple implements such as a wooden trough, a locally made dough brake, and a mud oven. Their assets ranged from M1,290 to N519,000 worth. In bread distribution, the baker occupies the top-most position in the system, with the ultimate consumer at the bottom while the vendors act in between the two. Profit margins vary between N14 and N38 per bag of flour. There are so many retailers in the system that their profit is just fair to keep them in the trade; what actually accrues to them is in the form of commission usually fixed by the bakers themselves. Retailers bear most of the risks inherent in bread trade. Factors which limit commercial production of bread are inadequate number of wooden trough, a locally made dough brake to supply floury lack of large wheat farms and the bakers' poor technical knowledge in bread making. It was found that bread quality, flour plant capacity, and bread distribution systems were significantly correlated to sales of bread in the Cross River State. Positive factors common to both states were bread wrapping, and educational level of the manager. Based on this analysis, strong recommendations are made to effect the establishment of large wheat farms at ecologically suitable zones, more flour mills, credit institutions, vocational schools for bakers and better communication systems throughout the country to enhance bread quality and professional efficiencies.
Open Access
Relationship between Research Instrument Format and Mode of Response
(Obafemi Awolowo University, Ile Ife, Nigeria, 1984) Solanke, Olunfunlola O.
This study was set out to find the relationship, if any, between variables such as Sex, Age and Discipline of an individual and responses made on the different formats of a questionnaire. The Study made use of four questionnaires each with five formats. Undergraduates of the Faculties of Arts, Education and Social Sciences, University of Ife were sampled for the study. The hypotheses were tested using student t-test analysis and one-way analysis of variance. The hypotheses were tested on each questionnaire and formats therein. Some of the findings of the investigation are: i) there was no difference between responses made by Males and Females on the different formats of ATPQ, but there were differences on the ATGQ (Semantic distance), ATTQ (Graphic rating), ATEQ (Semantic distance); ii) there were no differences between responses made by individuals of different ages on the different formats of ATPQ and ATEQ but there were on ATGQ (Semantic distance) and ATTQ (Graphic rating); iii) there were differences on all the questionnaires, ATPQ (Thurstone, Likert, Graphic rating), ATGQ (Semantic distance), ATTQ (Semantic distance and Graphic rating), ATEQ (Likert);for testing discipline on Questionnaire format. The ATGQ (Semantic distance) and ATTQ (Graphic rating) showed differences on all the variables (Sex, Age and discipline) for testing the three hypotheses; the Thurstone format ranked least on the mean scores on all the-questionnaires. The Semantic distance ranked best, then the Likert, Dichotomous and Graphic rating. Some of the recommendations made from the study include a replication of the Study using other questionnaires and variables. Users of different scaling formats should be aware of the merits, demerits, uses and abuses of the formats they are employing
Open Access
Determination of the Optimum weight/age and Composition of Broiler in Tropical Environment
(Obafemi Awolowo University, 1984) Williams, Adebayo R.
In a study to determine optimum slaughtering age of broilers in Nigeria, 605 Cobb broilers were raised on floor pens, The birds were weighed weekly and 2 birds/pen were slaughtered fortnightly from six to sixteen weeks. Body weight, carcass weight, abdominal fat thickness and fat weight were measured. Internal body fat was determined by ether extraction of homogenised whole carcass less bone. Twoway analysis of variance, simple and multiple regression and correlation analysis were carried out. Data on costs, revenue and net returns were obtained by questionaire survey of poultry farms around Ile--Ife. The data were summarised and analysed graphically. Body weight, carcass weight, abdominal fat weight, abdominal fat weight as % live weight, abdominal fat thickness, total body fat, %total body fat, internal body fat and internal body fat as carcass weight were significantly affected by sex and age (P <0.01). Feed efficiency and feed conversion ratio were significantly affected by age (P <0.01).Highly significant correlations (P <0.01) were obtained among all body traits. Highly significant regression coefficients (P <0.01) were obtained by simple regression of internal body fat on carcass weight,body weight abdominal fat weight and fat thickness, Multiple regression analyses showed that, the regression was im--including fat thickness after abdominal fat weight and . fat weight after carcass weight, Total body fat prediction can be reliably based on carcass weight abdominal fat weight for broilers between 6 -16 weeks. Economics analysis revealed that profit is made when broilers till 16 weeks. When broilers are sold at a fixed price, the n point of slaughter is close to 12 weeks, but when broilers on weight basis, the optimum marketing age is just above and the physiological body data showed that fat deposition above after 12 weeks.
Open Access
The renewal of deteriorating urban centre: A case study of Sagamu core area
(Obafemi Awolowo University, Ile Ife, Nigeria, 1984) Sokoya, Jubril Temiyemi
and socio-cultural characteristics, facilities and services available in arriving at the means of reactivating the area. The techniques employed in the collection of socio-economic and physical data include the direct observation of the present situation, Questionnaire and interviews with the people to assess the land use pattern, age and conditions of buildings environmental sanitation and the traffic conditions. Efforts were also made to find out the opinions of the people about the environmental conditions of their area. The survey analyses showed that factors responsible for the continuous deterioration of the study area include inadequate community facilities and services such as public faucets, refuse collection centres, fire hydrants, parking spaces; conflicting land uses: poor maintenance of buildings; poor and narrow roads badly designed and excessively narrow road junctions, and unhygienic environmental conditions due to indiscriminate disposal of refuse. Consequently, proposals were made for the future improvements of the area under study based on the survey findings by recommending the rehabilitation of dilapidated dwellings and infrastructures and providing new services where such are inadequate or absent. Finally, it has been proposed that there should be administrative, financial and legal tools for the implementation of the proposed plan.
Open Access
Planning for recreational activities in Calabar city centre
(Obafemi Awolowo University, Ile Ife, Nigeria, 1984) Ukene, Daniel
Planning for recreational activities does not seem to be receiving serious attention from Policy makers in Nigeria. Although the Nigerian economy is currently undergoing serious crises, this should not affect planning for recreational activities. Intact, it has been observed that recreation has always constituted an important part of people's lives: in history no matter their level of poverty. This thesis is aimied at raising the awareness. of the community decision makers and the people generally of the importance of having and organising recreational activities in Calabar City Centre. It is observed in the analysis that the Cross River State Government and the Calabar Municipal Council have only paid lip-service to the recreational needs of the city Centre dwellers. The proposals put forward are derived from the study of the existing deficiences and anticipated future recreational needs of the people in the case study area. The proposals have been so drawn as to be within the reach of the financial capability of the people. They have also been designed to respect their socio-cultural background and be of physical and Psychological benefit to the individuals. The successful implementation of the proposals put forward calls for a high degree of coordination to ensure that the right amount of resources, is available at the right time and in the right place.
Open Access
Cytogenetic studies of four Species of Anura, (Amphibia).
(Obafemi Awolowo University, 1985) Fakayode, Stephen Femi
The chromosomes of four species of Anura were studied. The four species consists of two species of Bufonidae, (Bufo regularis and Bufo latifrons) and two species of Ranidae, (Ptychadema oxyrhincus and Rana galamensis). The chromosomes were prepared from bone marrow treated with hypotonic potassium chloride solution, fixed in 3:1 methanol acetic acid mixture and stained in 1% acetic-orcein stain. Chromosomes of well spread cells were counted, measured, and their arm ratios, relative lengths and centromeric indices were determined. From these measurements, the chromosomes were classified and their idiograms were constructed. Photomicrographs of well spread mitotic metaphase chromosomes were taken and from these the haryotypes were arranged. A chromosome complement of 2n = 20, 2n = 20, 2n =24 and 2n = 26 were recorded for :ado regularis, Bufo latifrons, Ptychaaema hincus and Rana galanensis respectively. The chromosomes show clear demarcation into large and small elements. There were no satelites and no microchromosomes. No sex chromosomes were observed. The small number of chromosomes where are relatively large in size and which were bi-armed marks the amphibians as a conservative and primitive group of vertebrates in comparison with the reptiles and birds which have large number of microchromosomes. The probable evolution of the 20 and 22 chromosome complements of Bufo regularis and Bufo latifrons is considered.
Open Access
The design of an integrated database management system for a Nigerian University Environment
(Obafemi Awolowo University, Ile Ife, Nigeria, 1985) Fisusi, Zaccheaus Rotimi
The rapid growth in the size and complexity of the Nigerian University demands a more effective and efficient information management technique than has been available or necessary in the past. In some Nigerian Universities at present, computer-based data files are established to serve personnel, payroll and student application needs. Data is selectively and frequently copied from source files and merged with transactions to construct new files appropriate for the application. In this project, an attempt has been made to design an Integrated Database management system that combines the transactions in the Personnel, payroll and student application' areas in a Nigerian University to replace the present separate file method approach for each application area. The approach is based on the concept of Relational Database model, starting with the construction of relationship graphs and entity-relationship model diagrams in the Information Structure design phase and ending with the definition of the conceptual scheme in the Information Structure Implementation phase.
Open Access
Studies into some factors which affect the dissolution rate of non-disintegration pellets
(Obafemi Awolowo University, Ile Ife, Nigeria, 1985) Ayankogbe, Adetutu Adebambo
The influence of granule size and lubricants on the dissolution rate of Aspirin, Salicylic Acid and equimolar mixture of both are reported. This study involved three stages viz: (i) The influence of different granule sizes of Aspirin and Salicylic Acid on dissolution rate of non-disintegrating disks; (ii) The influence of different granule sizes of selected lubricants (fixed concentration) on the dissolution rate of Aspirin and Salicylic acid (of a fixed granule size); (iii)The influence of different concentrations of other lubricants on the dissolution rate of Aspirin, Salicylic Acid and an equimolar mixture of these drugs. Granule size fractions of the test drugs studied were 75/45-, 90/75-, 150/90-, 250/150- and 355/250 microns. The dissolution rate of disks prepared from these granules revealed it was unaffected by the granule size. Lubricants employed for the study of the influence of different sizes of lubricants on the dissolution rate of compressed disks were Magnesium Stearate, Talc, Stearic Acid, Boric Acid, Sodium Lauryl Sulphate and Polyethylene Glycol 6000. Each pellet of Aspirin and Salicylic Acid contained 3 percent of each size fraction of the lubricants. It was observed that the dissolution rate of the pellets was unaffected by the particle size of these lubricants. In the third series of experiments, both hydrophobic and hydrophilic lubricants were tested. The former group were Glycerol Monostearate, Benzoic Acid, Talc, Magnesium Stearate, Sorbitan Monostearate (Span 30) and Polyethylene Glycol 4000 (PEG 4000) while the latter group were Alginic Acid, Sodium Acetate, Polyoxyethylene Sorbitan Monostearate (Tween 80), Maize, Potato, Rice and Cassava Starches and Polyethylene Glycol 6000 (PEG 6000). Generally, as the concentration of the hydrophobic lubricants increased from 1.0 - 5.0%, there was a decrease in dissolution rate. Talc, Span 80 and PEG 4000 however unaffected the dissolution rate. The starches showed no appreciable change in dissolution rate from concentrations of 0.1% - 5%.
Open Access
Effect of Soil Texture, Nutrient Stress and Water Stress on Yield of Andropogon Gayanus Kunth and Schizachyrium Sanguineum (Retz.) Alston.
(Obafemi Awolowo University,, 1985) Oke, Samson Olajide
Two grasses, Andropogon gayanus and Schizachyrium sanguineum grown to maturity in fine and coarse sand culture were subjected to nitrogen and water stresses to study how these stresses interact with soil texture in affecting growth and nitrogen accumulation in these grasses. Nutrient-stressing involved administering 200m1 of a nutrient solution containing. 35 parts per million nitrogen once in four days while for water-stressing the same volume of water was fed to the plants at the same frequency. These treatments, if administered once in two days, were considered adequate for the plants. There were two other intermediate treatments. Plants grown in fine sand produced more dry matter the highest yield was adequate nitrogen and water stressing while nutrient and water stressing gave the lowest. The biomass of the two grasses increased with increased nutrient addition to the growth medium. Nutrient stress had a more noticeable effect in reducing yield than water stress. Plants grown in coarse sand had a higher nitrogen concentration than those grown in fine sand. This is attributable to high organic matter content of fine sand the highest yield was adequate nitrogen and water stressing while nutrient and water stressing gave the lowest. The biomass of the two grasses increased with increased nutrient addition to the growth medium. Nutrient stress had a more noticeable effect in reducing yield than water stress. Plants grown in coarse sand had a higher nitrogen concentration than those grown in fine sand. This is attributable to high organic matter content of fine sand grown grasses which led to dilution of nitrogen concentration. In absolute terms, plants grown in fine sand had more nitrogen content. Increasing frequency of nitrogen addition resulted in higher nitrogen content of the grasses. As with yield, giving adequate nitrogen and water-stressing resulted in the highest nitrogen accumulation while water and nutrient stressing gave the lowest. Schizachyrium sanguineum accumulated more nitrogen than Andropogon gayanus because it is more efficient in utilizing nutrients in a low concentration medium. As for plant parts more nitrogen was accumulated in the roots than leaves or stems. The implications of these observations in relation to the natural conditions in which these grasses grow are discussed
Open Access
An valuation of The use of Mechanical Plant in Construction: a Case Study of Selected Number of Sites.
(Obafemi Awolowo University, 1985) Lasabi, Babatunde Tajudeen
The study focuses on the practice of managing construction plants as a pre-condition for their affective utilisation in the Nigerian construction industry. It shows that the economic life of a plant depends on adequate maintenance and that appropriate education and training for the plant operators enhances the efficiency of plants and equipments. It also discusses the issue of costing in relation to construction operations and hence highlights the consequences of inadequate computation of costing items. The research methodology includes the examination of plant use management taking cognisance of the contractors' organisational set up as a basis for operation. The research concludes with a set of recommendations such as adequate training of operators, restricted choice of brand of plants and adequate managerial personnel in order to enhance the productivity of contractors.