Impact of agricultural innovation adoption: a meta‐analysis

The impacts of adopting agricultural innovation and technology are widely examined. This paper synthesises 154 studies, which yielded a total of 600 estimates of the impact of adopting agricultural innovation and technology on production, social and economic outcomes. Using meta‐regression analysis, the empirical results show that the reported impact of adopting agricultural innovation and technology rises significantly over time, notwithstanding a significant publication bias. Whether studies find significant impacts of adopting agricultural innovation and technology depends on the use of experimental research designs, parametric method, endogenous switching regression and region. Our results show a large bias in the literature towards agricultural innovations and technologies that focus on high‐yielding varieties and thus, neglect other forms of complementary innovations and technologies.     

Impact of Education on Household Welfare in Nigeria

Human capital development, especially higher educational attainment, attaches high premium to its expected economic benefits, in form of better welfare. This study investigates the effect of educational attainment of household head on two indicators of household welfare, namely labour market earnings and household per capita total expenditure on food and non-food items in Nigeria. The study uses the Double Hurdle (DH) model and Quantile Regression (QR) to address these objectives. The empirical results show that returns to schooling are substantially higher at the tertiary level of education compared with primary, secondary, and postgraduate levels of education in Nigeria. Furthermore, additional years of tertiary education attainment by household heads was found to increase household per capita total expenditure more than additional years of primary, secondary and postgraduate education. The implication of these findings is that the improvements in economic welfare of households in Nigerian is driven more by the attainment of tertiary education by household heads, relative to other levels of education.     

A Review of Nigerian Agricultural Efficiency Literature, 1999–2011: What Does One Learn from Frontier Studies?

Abstract: The objective of the study is to provide a critical overview of Nigerian agricultural efficiency literature covering 1999–2011. A total of 156 frontier studies which yields 210 observations were used for the review. The preliminary findings from both the Funnel Plot and Funnel Asymmetry Test revealed that publication bias is not a severe problem in the selected literature. Our findings via univariate scatter plot and Spearman correlation provided evidence that reported efficiency scores positively correlated with the year of survey in the primary study. However, this observation might be an indication that positive efficiency change in the total factor productivity (TFP) growth characterized the development of Nigerian agricultural sector over the years. The average efficiency estimate from all the reviewed studies is about 0.71, thus suggesting, there is considerable room for improvement in the sector. To further distil important policy findings from the primary literature, we observed that 48 percent of the observations identified education as a significant determinant of efficiency in the Nigerian agriculture over the years. Likewise, experience was shown to be an important variable by 33 percent, while 23 percent identified age as a key determinant. Also, 19 percent showed that extension and family size are important. The directions of future research are also outlined.