Eriko Yasunaga

Online Monitoring System on Controlled Irrigation Experiment for Export Quality Mango in Thailand

Export quality fresh mango fruit requires a careful management from production to distribution in order to meet a high standard specifically for a long supply chain. In this paper, we describe our online monitoring system to observe responses of mango trees to different levels of irrigation intensities, based on which an optimal irrigation regime can be established. The system consists of different sensors for soil moisture content, sap-flow, photographs, and so on. To fully control the amount of water irrigated, rain-out shelter was installed for every tree for the experiment. Field observation data are used to compute water consumption and water stress of target trees. Preliminary results supported the practicality of this system that can further be used for quantitative assessment and numerical simulation for optimizing a production system aiming at a long supply chain.

Effect of Environmental Condition on Xylem and Phloem Transport of Developing Fruit

Abstract In production of Satsuma mandarin ( Citrus unshiu Marc.) grown on greenhouse cultivation, management of day and night temperature and soil water content is important to improve yield and quality of the fruits. In this study, in order to optimize greenhouse environment for Satsuma mandarin production, we conducted dynamic analysis of effects of soil water content, day temperature and night temperatures on fruit growth and mass accumulation through phloem and xylem into a fruit.