Informal network helps disseminate agricultural knowledge in the rural
area where formal extension is lacking. However, how the interplay
between formal training and informal network promotes technology
adoption is still under-studied. This paper aims to examine the effects
of training locations upon knowledge and adoption of agricultural
techniques via strengthened informal and formal social networks. We
administer agricultural training of identical contents in farmers’
hometown and in more remote but advanced locations and arrange farmers
to travel to the respective locations. Then, we examine locational
heterogeneity effects upon conservation and plant-rehabilitation
techniques, and social network variables with formal extension services,
informal network, and between participants and non-participants. Only
farmers trained in the most remote location increase the size and depth
of social network with their peers, extension expert, and
non-participants upon returning from training. These changes in social
networks may encourage them to adopt the technology. While formal
training is important for knowledge diffusion, informal network is the
key for successful adoption, and these networks are strengthened via
training held in the most remote location.