In this study, we examine the effects of own and peer adoption of improved soybean variety on household yields and food and nutrient consumption, using observational data from Ghana. We employ the marginal treatment effect approach to account for treatment effect heterogeneity across households and a number of identification strategies to capture social network effects. Our empirical results show that households with higher unobserved gains are more likely to adopt because of their worse outcomes when not adopting. We also find strong peer adoption effect on own yield, only when the household is also adopting, and on food and nutrient consumption when not adopting. However, the peer adoption effect on consumption attenuates when the household adopts the improved variety. Furthermore, our findings reveal that adoption tends to equalise households in terms of observed and unobserved gains on consumption and can thus serve as a mechanism for promoting food security and nutrition in this area.
The worsening poverty situation in the Upper West Region of Ghana coupled with the risky nature of farming due to the joint impacts of rain-fed dependence and minimal use of irrigation in Ghana called for the need to examine small-scale irrigation usage and its effect on farmers' income and access to essential services. The study was carried out in Busa where 300 farmers were randomly sampled. The Conditional Recursive Mixed-Processes (CRMP) was used to estimate two Probit and a multiple linear regression models. The study revealed that market information and participation as well as input cost affected farmers' decision to use irrigation. Also, irrigation usage, market participation and price information, capital invested and institutional support had significant effects on farm income. However, occupation, farmers' educational attainment and incomes were the significant determinants of access-to-essential services in this area. Hence, irrigation is relevant to promoting farm income in the area since its use translate into increased income. Farmers in the area would minimize production costs and risks when encouraged or motivated to initiate or participate in small-scale irrigation since such schemes are not cost and technically intensive.
We use a detailed dataset to examine the impact of social networks, conditional on contextual and individual confounders, on farmers' adoption of competing improved soybean varieties in Ghana. Based on the contagion conceptual framework, we employ a spatial autoregressive multinomial probit model to examine how neighbours' varietal and cross-varietal adoption of improved varieties affect a farmer's adoption decision in the social network. Our results show that adoption decisions in a network tend to converge on one variety, such that beyond a threshold of adopting neighbours of that improved variety, the cross-varietal effects tend to lose significance in the network. If the shares of adopting neighbours of the improved varieties are equal, we find evidence that farmers are not more likely to adopt either improved variety compared to farmers with no neighbours who have adopted the improved varieties. The findings demonstrate the significance of neighbourhood effects in the adoption of competing technologies.
This article presents a systematic review of the literature on policy options to improve food security and nutrition in developing countries, and an empirical analysis of the impact of smallholder market participation on food security and nutrition in Ghana. The review focuses on the impacts of policy strategies such as structural changes in relative prices, agricultural infrastructure, economic incentives, and agricultural technologies. To account for threats of selection bias and omitted variable problem, the empirical analysis uses an ordered probit selection model to jointly estimate households' market orientation decisions and food and nutrients consumption. The empirical results show that transitioning from one market orientation to another significantly increase households' food and nutrients consumption.
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