This paper aims to provide empirical evidence on the educational effect on productivity in the agricultural sector of Thailand using an economic analysis and national level data during 1970-2014. Education is measured as the percentage share of the agricultural labor force with upper secondary education in the total agricultural labor force. Agricultural workers with at least upper secondary education are considered higher educated groups of workers thereby representing human capital in the agricultural sector. Productivity is measured as Solow-type total factor productivity that represents technological progress. Preliminary results using an econometric model and technique show that education has a positive and significant impact on the productivity. Therefore, a continuous public support for workers to attain higher level of education is still necessary for raising the productivity in the case of Thailand.