1. Introduction In conventional intensive banana monoculture systems, fertilization, mainly mineral-based, is managed to keep high levels of mineral elements in soil, in order to ensure maximal crop nutrition and compensate for leaching losses. It actually results in excessive applications of fertilizers, far surpassing plant's uptake and soil absorption capacity (Godefroy & Dormoy, 1983). With the development of agroecological banana cropping systems in French West Indies (FWI), adjusting fertilization to plant's requirements in order to reduce nutriment losses by leaching became a priority. But these new banana cropping systems, based on increasing use of organic fertilizers and cover crops in association with bananas could show nutritional stresses for crop. To prevent them, the nutritional status of crop is typically assessed through chemical leaf analysis, it allows a prompt correction of deficiencies. However, this method is not easy to use because it doesn't take into account N dilution with biomass growth (Lemaire et al., 1984). Furthermore, long-term management by soil nutrition is crucial to ensure fertility, although soil diversity in the French West Indies with different exchanges capacity complicates even more this management. The management of fertilization in the new banana cropping systems, more complex, requires the design of new decision support tools in order to adjust the inputs of fertilizers dynamically based on plant nutritional status and soil resources availability. Here, we present a conceptual framework of a Decision Support Tool designed to assist agricultural advisory in fertilization management of banana cropping systems in the French West Indies. 2. Materials and Methods The conceptual framework of the decision support tool has been realized in three steps: 1. A literature review of plant and soil nutritional status diagnostic methods. 2. A detailed analysis of recommendations for fertilization of banana cropping systems through interv