Since a fertile top soil in Fukushima, Japan was contaminated with radiocesium due to the nuclear power plant accident occurred in 2011, the fertile top soil was stripped off and replaced by a less fertile sandy soil as a decontaminating process. We applied a cloud-based drip fertigation system, called ZeRo. agri, to grow bell pepper in the less fertile soil in a greenhouse. The Penma-Monteith equation was used to estimate potential evapotranspiration (ET p ), and time domain reflectometry

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... probes were used to measure two-dimensional soil water distribution. The amount of excess water in soil gradually became smaller as time proceeded. Although the daily apparent root water take agreed well with the daily amount of irrigated water regulated by the cloudbased system, the Penman-Monteith equation sometimes underestimated the daily ET p . The underestimation might be resulted from the overestimation of the aerodynamic resistance in a greenhouse.