Search

• Site-specific nutrient management extension advice through digital support tool. • Three-year randomized control trial with 792 smallholder maize farmers in Nigeria. • Incremental increases (up to 18%) in nutrient application, yield and revenue. • Improved nutrient use efficiency and reduced greenhouse gas emission intensity. • Gradual and sustainable intensification of smallholder agriculture in Africa. There is growing evidence on the impacts of site-specific nutrient management (SSNM) from Asia. The evidence for Sub-Saharan Africa (SSA), where SSNM developments are more recent and where conditions concerning soil fertility and fertilizer use differ importantly from those in Asia, is extremely scarce. We evaluate a SSNM advisory tool that allows extension agents to generate fertilizer recommendations tailored to the specific situation of an individual farmer's field, using a three-year randomized controlled trial with 792 smallholder farmers in the maize belt of northern Nigeria. Two treatment arms were implemented: T1 and T2 both provide SSNM information on nutrient use and management, but T2 provides additional information on maize price distributions and the associated variability of expected returns to fertilizer use. We estimate average and heterogenous intent-to-treat effects on agronomic, economic and environmental plot-level outcomes. We find that T1 and T2 lead to substantial increases (up to 116%) in the adoption of good fertilizer management practices and T2 leads to incremental increases (up to 18%) in nutrient application rates, yields and revenues. Both treatments improve low levels of nutrient use efficiency and reduce high levels of greenhouse gas emission intensity, after two years of treatment. Our findings underscore the possibility of a more gradual and sustainable intensification of smallholder agriculture in SSA, as compared with the Asian Green Revolution, through increased fertilizer use accompanied by improved fertilizer management. [ABSTRACT FROM AUTHOR]

• The main pillar of the Government of Nigeria (GoN)'s 'National Strategy for Scaling up Sanitation' reduces open defecation in low-wealth areas. • Our results can be used by the GoN to target the Community-Led Total Sanitation (CLTS) intervention more effectively. • We show that these findings may also be useful for the targeting of CLTS beyond the Nigerian context. • Different or complementary approaches are needed for areas characterised by higher aggregate wealth. Sanitation is at the heart of public health policies in most of the developing world, where around 85% of the population still lack access to safe sanitation. We study the effectiveness of a widely adopted participatory community-level information intervention aimed at improving sanitation. Results from a randomized controlled trial, implemented at scale in rural Nigeria, reveal stark heterogeneity in impacts: the intervention has immediate, strong and lasting effects on sanitation practices in less wealthy communities, realized through increased sanitation investments. In contrast, we find no evidence of impacts among wealthier communities. This suggests that a targeted implementation of CLTS may increase its effectiveness in improving sanitation. Our findings can be replicated in other contexts, using microdata from evaluations of similar interventions. [ABSTRACT FROM AUTHOR]

Background: School-based programs are the most convenient interventions to tackle substance use among youth. "Unplugged" is a Social Influence universal school curriculum developed and tested in the "EU-Dap" project. In 2015, Nigeria implemented a large-scale project to promote healthy lifestyles in schools, families and communities. Within the project, the effectiveness of "Unplugged" was evaluated through a cluster randomized controlled trial.Methods: The program was adapted to the Nigerian context, assembling suggestions from monitoring forms and interviews, and performing fidelity checks on content and method. Thirty-two secondary schools were extracted from a list provided by the Federal Ministry of Education, and randomly allocated to intervention and control arms. A self-completed anonymous questionnaire was used for baseline and follow-up surveys. The analysis sample finally included 2685 pupils (mean age 14.2 years). Multilevel models were run to estimate program effects on prevalence of self-reported cigarettes, alcohol, and marijuana use. Mediation analysis was performed to identify possible mediators of program effect on alcohol use.Results: Unplugged significantly reduced the prevalence of recent alcohol use in intervention vs control pupils. The effect on prevalence of cigarette and marijuana use was not statistically significant. The program prevented progress and encouraged regress across stages of intensity of alcohol use. Negative beliefs, risk perceptions, and class climate mediated the effect of Unplugged on alcohol use.Conclusions: Unplugged was effective in preventing alcohol use improving beliefs, class climate and risk perceptions among Nigerian students. The implementation of the program at a larger scale in the country should be supported. [ABSTRACT FROM AUTHOR]