The main gap when dealing with carbon balance from agriculture is the lack of Activity Data by farmers that they are related by agriculture management such as crop involved, rotation or not, ploughing type, chemical fertilization type, disinfection type, organic amendment type, etc. This huge amount of information can only be precisely provided by farmers, being the key point. The added value of the Life GEOCARBON project is to involve farmers, which hold this information exclusively, to fill this gap which exists in Activity Data acquisition. The project will encourage farmers to insert the data relating to their agricultural activities by using a friendly mobile web-GIS application in their smartphones. The provided Activity Data will be saved automatically in a Geospatial Database that will be the core of the project.