Provided is a plant cultivation system that acts directly on plants in nutriculture to effectively eliminate microbes. The plant cultivation system is provided with a cultivation tank (4) for holding the culture solution (5), and sterilization light sources (8) for emitting ultraviolet light that inhibits the activity of pathogenic microbes present in the culture solution and on the crops. The system irradiates the light emitted from the sterilization light sources (8) toward the root region (2) of the crops.
