Pre-print, Working paper: Agricultural input subsidies are often considered key instruments to increase adoption of new technologies in developing countries. Using unique experimental data from Equa- teur province in DRC, we document the e_ectiveness of such interventions in increasing households adoption of modern seed varieties (MVs). High subsidy levels increase adop- tion, in particular when other access constraints were also relieved. Demand is highly price sensitive, but demand curves do not display strong discontinuity at low prices. We _nd very limited spillover e_ects on adoption by non-voucher recipients. Adoption persists to some extent in the season that follows voucher distribution.