Concerns about the quality of agricultural technologies limit adoption among smallholder farmers. We conduct a randomized controlled trial with 350 agro-dealers and 3,500 maize farmers in Uganda to evaluate two interventions. A seed handling training aims to close agro-dealers’ knowledge gaps, while a crowd-sourced review platform targets information asymmetries by aggregating farmer feedback. The platform improves customer service and incentivizes quality signaling by agro-dealers, increasing their sales. It also enhances farmers’ perceptions of seed quality, raising adoption of high-yielding maize varieties and improving harvest outcomes. In contrast, the training has no measurable effects on agro-dealers or farmers.
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