September 2010
A review of non-conventional energy systems and environmental pollution control
The massive increases in fuel prices over the last years have however, made any scheme not requiring fuel appear to be more attractive and to be worth reinvestigation. In considering the atmosphere and the oceans as energy sources, the four main contenders are wind power, wave power, tidal and power from ocean thermal gradients. The renewable energy resources are particularly suited for the provision of rural power...
September 2010
Effect of quantity and placement distances of inorganic 15-15-15 fertilizer in improving soil fertility status and the performance and yield of maize in a tropical rain forest zone of Nigeria
The high cost of mineral fertilizer in crop production had necessitated an investigation into the optimum fertilizer rate for profitable maize production. The study was conducted in Akure (7°15’N, 5°12’E) in Nigeria in 2007 and revalidated in 2008. The experimental design was a split plot method in a randomized complete block with fertilizer quantity as the main plot and fertilizer placement distance...
September 2010
Assessment of integrated soil and water conservation measures on key soil properties in South Gonder, North-Western Highlands of Ethiopia
Land degradation caused by erosion was an environmental threat that hampered agricultural production and the causes include: over cultivation, overgrazing, overpopulation and deforestation. Loss of productive land undermined rural livelihoods and national food security. The major factors discouraged farmers adoption of soil conservation measures were labour shortage, land tenure uncertainty, fitness of structures and...
September 2010
A fractal approach for estimating soil water retention curve
Direct measurement of soil water retention curve (SWRC) is time consuming and expensive, therefore many empirical models have been developed to describe it. Also fractal models have been proposed in the last decades for estimating SWRC. In this study, the fractal dimension of SWRC (DSWEC) and the mass fractal dimension of soil texture for 30 soil samples (with a spread range of soil texture) were determined. Fractal...
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