We developed a mobile phone-based field datalogger system for mandarin orange production. The system focuses on collecting data that can be used to determine the watering schedule for cultivation using multi combined with drip irrigation. In the study area at Kumano, in Japan's Mie Prefecture, automated field monitoring was performed using Field Server, a server computer installed in the field and a sensor network to collect weather information. However, indicators such as fruit size, fruit hardness, leaf roll, and soil or tree volumetric water content are still collected by visual inspection, creating a burden for the field workers. The system we developed lets them input measurements of these indicators directly in the field. The data is then stored by Field Server along with data from other users and environmental data measured by Field Server or Japan's AMeDAS system. The results can be visualized as a timeline using a Web-based system, and the users can compare their results with data from other users, and can then consult with experts in their area.
