University of Nigeria, Nsukka

About: University of Nigeria, Nsukka is a education organization based out in Nsukka, Nigeria. It is known for research contribution in the topics: Population & Health care. The organization has 10211 authors who have published 13685 publications receiving 138922 citations.

Effects of Gliricidia sepium (Jacq.) Steud and Leucaena leucocephala (Lam.) de Wit on growth and development of Imperata cylindrica (L.) Raeuschel.

Abstract: Field studies carried out in a forest transition site on a tropical Alfisol in southwestern Nigeria, show that shading by gliricidia (Gliricidia sepium (Jacq.) Steud) and leucaena (Leucaena leucocephala (Lam.) de Wit) hedgerow species reduced density of speargrass (Imperata cylindrica (L.) Raeuschel) by 67% and 51%, respectively. Shoot biomass of speargrass decreased by 81% and 78% in gliricidia and leucaena hedgerows, respectively. Reduction in speargrass rhizome biomass in gliricidia plots was 96% while rhizome reduction in the leucaena plots was nearly 90%. Rhizome mortality was significantly higher in gliricidia plots than in leucaena and control plots. The bulk of rhizomes was found between 10 cm and 20 cm of soil depth but rhizome did not penetrate further than 30 cm depth in the Alfisol in which this study was carried out. Gliricidia was better than leucaena hedgerow species in suppressing speargrass.

Size and Causes of the Informal Sector of the Nigerian Economy: Evidence From Error Correction Mimic Model

Abstract: This work was motivated mainly by the need to empirically examine the magnitude of economic loss attributed to informality in Nigeria. Specifically, the objective of the study is to examine the size, development, and causes of the informal sector of the Nigerian economy. In recent times, multiple indicators multiple causes (MIMIC) models are applied to time series estimating the size and development of the informal economy for a particular country. However, in order to obtain more accurate estimates about the size, development and causes of the informal economy in Nigeria, this work applied an error correction MIMIC (EMIMIC) model which estimates the cointegration equilibrium relationship and the error correction short run dynamics. The results show that since 1970, the size of the informal economy has hovered between 53.6 – 77.2% of GDP, and that the average size of the informal economy was about 64.6% of GDP. Specifically, the results indicate that informal sector was about three-quarters of GDP in 2010. Furthermore, the results show that unemployment, tax burden, government regulation, and inflation are the most important drivers of informality in Nigeria. Key words : Informal Sector, Nigerian Economy, Cointegration, Error Correction, MIMIC Model