In the face of the many direct and indirect interventions by development players dictated by rural development policies, there has been no noticeable change in agriculture, and structural constraints continue to hold back the sector’s development. However, faced with national and international economic constraints, economists in the rice-growing and agricultural sectors still tend to propose purely economic intervention or support measures, while agronomists and those who trust the motivations of grassroots producers still resort to the dissemination of new cultivation approaches with the aim of increasing productivity. But the question that arises is how innovation can bring about changes in farming practices. Assuming that the innovations introduced have only a partial impact on agricultural practices and development, this study looks at the changes brought about by the new techniques in the agricultural practices of farmers in Lake Alaotra.