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This paper examines the prospects and challenges of transition from the current inefficient and highly polluting road transportation system in Nigeria to a highly efficient and environmentally friendly road transportation system. The study used time‐series data from 1981 to 2019 within the framework of demand for gasoline and diesel in the structural time‐series estimation model, where the concept of the asymmetric price increase and underlying energy demand trends were incorporated into the models. The findings of the study show that both gasoline and diesel are highly price inelastic, and the UEDT is generally stochastic but exhibits a positive trend in a large part of the estimation period. The conclusion and policy implication of the result suggests that governments should combine incentives and public enlightenment on the importance of energy efficiency as well as transport infrastructure improvements with gradual adjustments of domestic prices in the short run. However, in the long run, policy should be extended towards massive investments in the transformation and modernization of the whole transportation sector in line with sustainability, efficiency and environmentally friendly goals in the transportation system of the country. [ABSTRACT FROM AUTHOR]

Construction industry has rapidly evolved in the past decade. Across some developing nations, the issue of building collapse has remained a disturbing factor, especially in the past three decades. In Nigeria, building collapse has become the subject of much academic discourse, albeit without many tangible improvements. For instance, after every incidence of building collapse in Nigeria, investigations are usually carried out and actions are taken. Unfortunately, the menace appears to have exacerbated in recent times. This study investigates the causes of building collapse in Nigeria from academic literature with a view of identifying the leading causes which may shape future government policies while seeking to address the situation. A system-thinking approach was adopted to build a causal loop diagram showing the interrelationships among all the identified factors. With the aid of a system-thinking software, Vensim, a causal loop model was developed which helped identify key leverage points on which policies can be based to control excessive building collapse in Nigeria. Three leverage points were identified as differential settlement, structural failure and structural issues, which are linked to the civil engineering discipline. Recommendations are made based on the study findings. [ABSTRACT FROM AUTHOR]

Two field experiments were conducted at the Teaching and Research Farm of the Institute for Agricultural Research; Ahmadu Bello University Zaria located on latitude 11011'N, longitude 7038'E and 686m above sea level in the Northern Guinea Savannah Ecological Zone of Nigeria in 2010 and 2011 cropping seasons. The objective of the study was to compare the yield of okra grown under different weed management strategies. The experiment consisted of four treatments namely: control, cucumber, watermelon and pumpkin. The experiment was laid out in a completely randomised block design (RCBD) with three replications. From the results so far obtained, pumpkin significantly gave higher mean values in both growth and yield characters measured, whereas the control treatment, significantly gave lower mean values of both growth and yield parameters throughout the period of assessment. [ABSTRACT FROM AUTHOR]