Assessing the impact of the Tropical Legumes II & III project on common bean productivity, profitability and marketed surplus in the southern highlands of Tanzania


This report assesses the farm-level utilization of improved bean seed (i.e. improved varieties) and its impacts on bean yield, incomes, and marketed bean surplus. To examine the farm-level utilization of varieties promoted under the Tropical legumes project, adoption data were disaggregated by varieties differentiated by year of release and measured in terms of household and area planted. Then, adoption was defined as a multivalued treatment variable to account for partial adoption while separating varieties promoted under the project from old improved varieties when comparing with landraces. Then, an inverse probability weighted regression (IPWRA) approach was used to estimate the impacts of improved bean adoption while modeling the outcome and the treatment to correct for potential selection bias.

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Date produced:
Number of pages: 48
File type: PDF
File size: 1.78 MB

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