In order to develop a strategy for a rice Green Revolution in sub-Saharan Africa, this study investigates the determinants of the adoption of new technologies and their impact on productivity of rice cultivation. We analyzed two kinds of data sets collected in Tanzania: a nationally representative cross-sectional data and a three-year panel data of irrigated farmers in one district. We found that not only irrigation but also agronomic practices taught by training play key roles in increasing the adoption of modern technologies and the productivity of rice farming