CONTROL DEVICE AND IRRIGATION PROGRAM

A control device controls a water supply device that supplies irrigation water to an open farm field in which a plant grows. The control device includes a storage unit, a calculation unit, and an output unit. The storage unit stores an environment value of each of a plurality of divided areas obtained by dividing the farm field and weather forecast of the farm field. The calculation unit calculates, based on an environment value and the weather forecast, an irrigation schedule in which supply time and amount of the irrigation water individually supplied to each of the plurality of divided areas during the irrigation period are determined. The output unit outputs to the water supply device, a control signal to control supply and no supply of the irrigation water to each of the plurality of divided areas based on the irrigation schedule.