Abstract: A cultivation device is disclosed for using in an artificial light plant factory. The device includes a cultivation room having a closable inside and a plurality of cultivation chambers including a plurality of stages in the cultivation room in the vertical direction. The device further includes an air circulation device that supplies air adjusted to a predetermined condition to each of the plurality of cultivation chambers at a predetermined flow velocity and collects and circulates the supplied air from the plurality of cultivation chambers. A nutrient solution circulation device is included to supply nutrient solution adjusted to a predetermined condition to each of the plurality of cultivation chambers at a predetermined flow velocity, and collects and circulates the supplied nutrient solution from the plurality of cultivation chambers.

Abstract: To provide a mechanism for performing environment control in a plant cultivation device and process control regarding to a work process for cultivating a plant. A plant cultivation device includes a plurality of sensors for monitoring a growing condition of a plant to be cultivated; an environment controlling unit for controlling an environment which is a condition of at least one of light, air, water, and space in the plant cultivation device; and a process controlling unit for controlling a work process for cultivating the plant.

Abstract: The present invention provides a system for changing an interval between plants without performing thinning work or transplanting work of plants. The nutrient solution tray is configured to include: a receptacle part for housing a plant, a nutrient solution-inflow area for allowing inflow of water or nutrient solution, and a nutrient solution-outflow area having at least one nutrient solution-outflow port for allowing the water or the nutrient solution to flow out. At least the receptacle part, the nutrient solution-inflow area, and the nutrient solution-outflow area form a bottom surface of the nutrient solution tray. The nutrient solution tray includes a first installation surface pair comprising a first installation surface and a second installation surface. The first installation surface is formed in a side of the nutrient solution-inflow area in a longer side direction of the nutrient solution tray.