Local knowledge termed traditional knowledge contributes to the quality of human life improvement in rural area. As the local knowledge which held by Mekar Jaya villagers, traditional agricuture practices emphasizes continuity and long-term practices. This article discussed about how local knowledge contribute to rural development as a whole of agricultural system. How external modern technology meets the accumulated traditional knowledge are elaborated in a social-ecological system using system archetype. The value of traditional agriculture practices have shifted gradually from food security purpose to food commercialization in line with the modernization technology. Social element in local agriculture practices looks more respect to environment than modern agriculture practices, while social element in modern agriculture tend much more to economic aspect. Finally, personal curiosity and willingness to learn, together with social networking among farmers and community, and supportive formal knowledge and governance structures, are learning point for successful sustainable agriculture development