Journal Articles

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Journal Articles (Agricultural and Environmental Engineering)

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    Desorption Isotherms for Plantain at Several Temperatures
    (Faculty of Agriculture, University of Ife, 1985) Ajibola, O. O.
    Moisture equilibrium data for desorption of water from ripe and unripe plantain were obtained at 40°, 50o, 60° and 70o over a range of relative humidities from 10 to 90 percent, using a static gravimetric method. Rite plantain exhibited higher equilibrium moisture content (EMC) than unripe plantain under the same conditions. A non-linear least squares regression programme was used to fit 5 desorption isotherm models to the experimental data and the parameters of the models evaluated. Using the modified Halsey model, the minimum standard error of estimates of the EMC was 1.9% for ripe and 1.4% for unripe plantain.
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    Influence of Speed and Land Slope on Uniformity of Distribution and Metering of Cowpea Seeds
    (Faculty of Agriculture, University of Ife, 1985) Saqib, G. S.; Segun, O. O.
    Investigations were carried out to evaluate the effects of field slope and forward speed on the metering uniformity of the grain drills for planting cowpea. The study was conducted in the laboratory using a John Decre model 8250 grain drill while the field slopes and forward speeds were simulated. The field slopes were varied from zero to 12.5 degrees, while the forward speeds were varied from 3 to 6 km/h. The metering uniformity of the drill was measured in terms of coefficient of variation in the seeds metered and delivered by various seed delivery tubes across the width of the machine. The actual seeding rate delivered by the - grain drill under various field and operating conditions was also determined. Results indicated that the field slope and forward speed had significant effect (p <0.01) on the metering uniformity and seeding rate. There was decrease in the metering uniformity and the seeding rate with an increase in the field slope in the range tested. Similarly, an increase in forward speed resulted in poorer metering uniformity and lesser seeding rate at the field slopes ranging from zero to 12.5 degrees. The interaction between the field slope and the forward speed appeared to be non-significant. Statistical models were developed to predict the metering uniformity and the seeding rate delivered by a grain drill operating at various forward speeds for planting cowpea seeds in sloping lands of Oyo State of Nigeria.
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    Studies on the Effect of Conditioning Processes on the Field Drying time of Forages
    (Faculty of Agriculture, University of Ife, 1983) Ajibola, O. O.
    The effects of conditioning processes, underlying layer and weather factors on field drying rate of alfalfa were investigated. Drying of chopped, macerated and dewatered alfalfa was affected progressively by the intensity of the change in physical characteristics and inversely by the rate of moisture transfer from the underlying surface. The depressing effect on the drying rate of rolling the macerated and dewatered samples into sheets approximately 6mm thick, was more noticeable on a wetter underlying surface.
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    Treating Rural Water without Introducing Harmful Substances
    (Faculty of Agriculture, University of Ife, 1980) Ogedengbe, O.
    The coliform count on the stream water studied was high. The water is a direct source of drinking water to some rural communities. A previous study established that about 100 ppm of chlorine in the form of chlorox was sufficient to bring: the coliform Most Probable Number (MPN) from about 11,000 per l00ml down to within allowable standard of one per l00ml of water sample. There is some concern that turbid water contains organic matter which when chlorinated could give rise to formation of chloroform and possibly other chlorine-based compounds of the trihalomethane family which conceivably could be carcinogenic. This prompted design and construction of a simple system of turbidity removal and chlorination. With this system the required chlorine dosage even went down to about -50 ppm.