Secondary schools in Uganda play a crucial role in agricultural education but their effectiveness remains underexplored. A randomized field trial was conducted across ten randomly selected secondary schools. Data collection included pre- and post-trial assessments of student knowledge levels and actual agricultural yields. The analysis revealed an average increase in crop yield by 15% among students who received targeted educational interventions compared to those without such support (p < .05, 95% CI: [8.2%, 21.7%]). Secondary schools can significantly contribute to agricultural yield improvement if equipped with appropriate teaching methods and resources. Investment in secondary school curricula should focus on agriculture-related subjects and training for teachers to enhance student learning outcomes. secondary education, agricultural yield, randomized field trial, Uganda The empirical specification follows $Y=\beta_0+\beta^\top X+\varepsilon$, and inference is reported with uncertainty-aware statistical criteria.